When I was on Ispiration the bars were open till 3am or so. Casino I am not sure about because I never in there past midnight but I am pretty sure it the same as bars. Now I just on there 3-10-05 though 3-14-05.
Recently on the NCL Wind the bar closed a lot earlier than we all left-which was 5am one morning and 3 am the last night of the cruise. Basically, we all hated that it was going to be over. I think it was closing a lot earlier on the shore days since everyone was wiped out from being tourists. Then we had 6 sea days(nites) and the bars got a LOT more active. They TRY to close earlier. . .good luck!
I hope that everything stays open till 3-4 in the am. I will be in the casino, but then DEF in the bar/club on the triumph until they kick us out. Im pretty sure if its spring break time its going to be fun. Dont you think?