I'm hoping the Burst cooldown is wrong and only 15 minutes for some weird testing purposes. Another thing is they removed the cooldown on sleep, so who knows what any of the actual cooldowns will be. Although its possible that the crowd control changes they were talking about for 1.21 involve eliminating the cooldown of sleep. Or maybe they were using sleepga and it has a shorter cooldown.

I guess my point is that speculation is... pointless. Wait a week and find out.