FMB Question

[Marabekm]

Hello all.
Got a quick question and needing some assistance. I am building a Pearl Harbor map, where I want the Japanese aircraft to attack American ships blah blah balh.
I don't want ships AAA to start firing before a certain time. So I made sure to put a sleep time on all the ships. The problem is, the ships are firing before this time should be expired.
So my question is.... 1st. The sleep time is Hour and Minutes right? And Not minutes and seconds? 2nd Is there any circumstances that would lead to the ships waking up early?


Update: So I think sleep time input is Minutes and Seconds. Hmm. Does anyone know the maximum time in minutes I can have an object sleep?