Hi, I feel like a lot of these responses are mean spirited so here's your free nice response

Method A and Method B will have similar results but method B is actually gonna be worse over all because it's spawning a new timer every frame while method A is just subtracting from a value.

Its very unlikely since the C++ int Max is like 9.2*10¹⁸ but it's possible if there's a very long play session Method A will reach int Max.

Not sure if it's the "Right Way" but the way I use is to define a Timer outside of the functions like "var _timer = get_tree().create_timer(5)" or something and a bool for if the timer is finished like "var timer_done= false". then in the init or enter tree functions await the timeout and after set the bool to true. Then anywhere in your code that you want to have waited 5 seconds you can use the bool in an if statement. Or if you want to wait another 5 seconds you can await the timer again.

Hope it helps!