I need a good book series to read that will take me a long time, but I would prefer it being an already finished series so I don't have to wait a long for the next one. Can you guys give me some suggestions?

Well there's the obvious like Harry Potter, but I'm going to assume that you've already read them. Umm have you read the Narnia series? Or the Uglies series, which is one of my favorites(although I wouldn't necessarily call it a long series).
Then there's The mortal instruments series( It isn't complete yet but there are 4 books out already). The Inkheart trilogy is also really good. Oh and of course The hunger games..
I hope that helped somewhat. :)

The Pendragon Adventure, Artemis Fowl, Percy Jackson and the Olympians, Inkworld trilogy, Inheritance Cycle, Harry Potter, The Ranger's Apprentice, Lord of the Rings

Not quite sure what kinds of books you like, but I'll list off a few of my favorite series.

Anne of Green Gables by Lucy Maude Montgomery
8 books in total

The Earths Children Series, Starting With Clan of the Cave Bear, by Jean Auel
6 big books in total

Daggerspell ( firstbook has many names for the series) by Katherine Kerr
like 13 books in total

Lord of the rings by J.R.R Tolkien
there are 3 books but if you read the Hobbit first that makes 4

Also one that is a littel fun is the
Confessions of a shopoholic by sophie kinsella,
There are about 6 books in the series, but I don't know if it is done yet.

I have 2 Clique series idk how many are in it and also The House Of Night series 8 in all im on 7

Some of my favourite finished series are:

The Bitterbynde Chronicles (Cecilia Dart-Thornton) - Fantasy, 3 books

The Night Angel Trilogy (Brent Weeks) - Fantasy, 3 books

Imo, the best books don't come in series, or in the the fantasy genre, but the only good series are in the fantasy genre.

EDIT: The author of the Night Angel Trilogy is considering writing another book for it

How about Percy Jackson series? Rick Riordan finished the first set of series. I'm sure it'll take you long, also, Riordan's putting a new set of installment - the one after Percy Jackson and the Olympians series.

The Princess Diaries
The Pretty Little Liars series (There might be four more though even though there's already 8)

There's The Clique. I haven't real them, but there's a section in my library for Teen Girls Series and there's like 15 books of The Clique.
There's Percy Jackson, and the second series that follows it, The Heroes of Olympus, but that one only has one book out and the next is out in the Fall.

cherub series has 12 books well 13 if you count the storie for world book day then henderson boys which is like a prequal to the cherub series and then theres another series of cherub the first book is called peoples republic its out the 4th of august 2011 the author of these books is robert muchamore hope this helped

well u shud read the vampire academy series, or the mortal instruments series!

Warriors by Erin Hunter.

So far, there are about 22 main books out, 4 super editions, 4 guides, and 11 manga. And they're still writing! So I think this will hold you for awhile. Plus its really good.

Well, there's the Left Behind series, by Tim Lahaye and Jerry B. Jenkins. It's 11 books in the main series, with three prequels and a sequel. But, they're somewhat hard to find, so you'll probably have to buy them off the internet.

Thirst series, also known as The Last Vampire, by Christopher Pike. It's better than it sounds, trust me. There's three books so far, and there's one more coming out soon.

Some shorter series that are still really good are; Beautiful Creatures by Kami Garcia and Margret Stohl, two books, the last one coming out in Oct; Strange Angels by Lily St. Crow, four books; and KIssed by an Angel by Elizabeth Chandler. There's only two books in this one so far, but the first one is about 800 pages long, and was orrigionally three books. It's really good.
Hope this helps!

I really enjoyed The Shadowmarch series by Tad Williams, and if you want a long one this is a REALLY long one, the books are pretty thick...
Four book:
Shadowmarch, November 2004.
Shadowplay, March 2007.
Shadowrise, March 2010.
Shadowheart, November 2010.

harry potter

Warrior Cats Eric Hunter
the book itself isnt long (well some of them are, but ya know what I mean ^_^), but the series has bout wut? 30 books?? no joke!
Description: This series is about a cat, and he gets caught trying to catch mice in Thunder Clan territory, and of course he's like "wut is Thunder Clan?" and the cats tell him, and he is asked to be joined to TC (Thunder Clan) He says yes, and the other cats say they don't want him. So yeah, REALLY good series!!!
Keys to the Kingdom Garth Nix
the books are long (sorta, if ya call 300-400 pages long, long) there are 7 books (this is one fo my faves!!!)
decribtion: A boy finds this house and in this house is a whole other place, and he finds out he has to defeat these ppl. and the ppl are named after the days of the week, and he has to defeat them in order of the days, (Mister Monday, Grim Tuesday,ect.) the end is AWESOME!!!

sooo... hope you like them!!! I did! ^_^!!!

If you want something that will take an enormous amount of time to read, try In Search of Lost Time by Marcel Proust. :) And let me know if you manage to read all the seven volumes, I'm still reading the second one. Well, it's not actually a "series", at least not in our modern sense, but a great novel nonetheless.

If you want fantasy, I recommend Tolkien's works. The Hobbit, the Lord of the Rings, the Silmarillion and the Children of Hurin (which are simply epic ♥) should be a bit time consuming. :)

there is one series that i am reading at the moment, its called 'the secrets of the immortal Nicholas Flamel' by Michael Scott, i love this series because all the characters in the book were real people or were gods from ancient civilizations like greek, roman and egyptions, the last one has come out recently so no mroe waiting, the books are about 400pgs each but there is a fair bit of research if you really want to get to know the characters

Theres the house of night and evernight

The Mortal Instruments Series.
Percy Jackson (and the olympians)
Vampire Acadamy

I read the Inheritance Cycle (Eragon Series) and it took about three or four months to read it but I was almost reading non-stop. This series is the best I've ever read.

Vampire Academy or City of bones
Preferably the former one :)

Legend of Drizzt by R.A Salvator. There's 25 (I think? It's either 24 or 25) books, and each book is at least 300 pages. And then Philip Athans edited and released an anthology of Drizzt stories. And the anthology is almost 400 pages and contains 12 short stories.

So... yeah.

My advise is even " The Tales of the Otori" It's SO Graet !!!

Percy Jackson & the Olympians is a five book series. The main story that started in The Lightning Thief is wrapped up in The Last Olympian

have you read the Power Of 5 series? it's really good and there are 5 books. In order they are: raven's gate, evil star, nightrise (my favorite), necropolis and oblivion.

My favorite series of books are The Alex Rider Series by Anthony Horowitz and Escape From Furnace Series by Alexander Gordon Smith. :D

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i would reccomend Percy jackson and the olympians series. it's really good. There are five books, but rick riordan has made another two series based on the same sort of thing, diary of a wimpy kid or the goosebumps series. but goosebumps is a bit of an old series and is more for younger ages. if your a teenager and like romance i woudl reccomend twilight and if you like fantasy iwould reccomend the inkheart trilogy, even though i havnt read it yet but everyone who ive asked said it was incredicle. hope i helped in some way!

You should read 'The Mortal Instruments'. There are 5 books already and the final book is due on May 2014.

The Maximum ride series theres either 6 or 7 i think and the last one came out last year

I have read and enjoyed Diana Gabaldon's Outlander series. They are between 600 and 900 pages and there are 8 or 9 of them. Also I have really enjoyed J.D. Robb's "In Death" series about a NY Homicide Detective's cases. It is set a bit in the future (like only 50 years) and has very neat inventions that are interesting. There are about 40 books in this series.