how long can i leave my main pumps off

well i had a little leak to day in one of my tubs problem is fix but i would like to keep water off it for as long as i can i still have a k1 and a 150gp pump going in the display how long till i have to re start my main pump

There is no set answer for that...it depends on bioload and temperature. If you add an air stone to your display you could extend the time.

added a heater and air stone to it hope i can hold out for a few hours

with the air stone and heater you should be ok for a few hours, Oxygen is the big thing you'd have to worry about, heat maybe not cause its super hot out.

tank is in the basement never too hot lol
but ty both

Well unless it will get dangerously cold, I think you are better off to let a mild "cold front" occur so that it slows respiration (and increases solubility of oxygen in the water). If it were me, i would skip the heater and crank the AC for a few hours.