well, it is not exactly dangerous but not very good to use either.
I believe it has inaccuracy. It approximately waits 0.27 more than given value.
It also doesn't stop when the game is paused, so if someone lags it continues to count down.
There might be more downsides to it than I remember. People will usually recommend timers instead of TSA.
Using it during map initialization should be safe in most cases. It boils down to how you use the function.
It should be fine to use if you don't mind it being somewhat inaccurate.
But I don't really see the need to use it for your reason as they should initialize in order. Unless you have a special case.
You also have the option to use Elapsed Time instead of Map Initialization.
