The days and the weeks can be long, but when you look back, it seems like it just flew by and you always begin to miss it... Okay the last part was a lie, you don't miss it.
Just realize you may have weeks where it seems like you just won't get any sleep till next tuesday... over and over again.. but it does make things go kinda fast.
In short, I think not getting much sleep was a really hard part for me, but some people did.