i wanna put a wait time between 2 codes
like

player.hp-=10;
wait 5 seconds //
player.hp+=10;

how can add a wait timer? (in new thread i dont wanna freeze my game)

You should do a flt timer and dimish it by time.rt once below 0 do your health+10 then reset timer to 5
I dont think its smart or gonna work to do sec thread and use sleep on it

Time.wait
And I agree mechanics like that should be done on the main thread similar to what RedcrowProd described