Originally posted by: Legendary Nin
Never questions the fuzzy brows.We don't know what Lee gained during his off-time.He was going in for surgery when the genin five left to get Sasuke.They've been gone for what seems a couple of months,so that gives Lee plenty of time to recover and fight.Remember Lee was in the hands of Tsunade,so obviously things were going to go over well.
Months? I don't think its been a day yet. And keep in mind Lee has to do the same traveling they do, so the difference in time isn't THAT much deviating from their fighting time. Even if Lee is faster it's not a big difference.

Plus, Lee's been walking around with a crutch and bad back for a little while. You'd think if anything he has to be weaker, especially comparing him to the 5 who left who've been gathering new techniques.

Oh well, just accept that there's not a lot of reality in fiction and enjoy it for what it is.