In NXT, how long do you have to wait for 1440 blocks to be mined? I see this referenced in many places with NXT for 1440 blocks. How long is that exactly?
1440 blocks in nxt is about 24 hours. Since nxt blocks are generated every minute, thats 1440 minutes.

1440 minutes / 60 minutes = 24 hours

NXT block generation isnt exactly 1 minute as some blocks are solved once every few minutes, but on average its about 1 minute. Hence the 1440 block mentions you see everywhere.