Yes it can take 2 hours to defrag, but the second time you defrag it just takes a few seconds. It did feel that little bit more smoother afterwards....
thanks for the link:
http://www.lagom.nl/misc/flash_fragmentation.html
so if it is twice as fast battery life will increase too
also our brains are defraged when we go to sleep in dream mode - that is why we have so many subjective modes - my theory