does anybody know how long negima will continue?

i've heard that there is just one arc left
is it true?
but i still think this story can continue a lot further then that...
cuz there are still so many unexplained things
and his whole mars project and his dream to become a magister....

Exactly where did you read this? Cause I'm about 95% sure that its bull
For the other 5% however is uncertainty because of the recent chapters... (mainly chp 350~351)
If you have a link or something to where you read this please do provide it

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Is this me in a nutshell?
Pretty much.

there are just 4 chapters left, negima will end in chapter 355, it was said by ken akumatsu in chapter 352 since he gave us the spoilers, you can read more about it in the forums

http://www.animenewsnetwork.com/news/2012-02-03/negima-m agister-negi-magi-manga-to-end-in-3-more-chapters

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Ore no Riaru to Netoge ga Rabukome
Anime -Westbound Apocalypse
- Fog hill of the 5 elements
- Batman of Shangai
- Kuiyu chouyuan