Koopa - Is the reason you want to keep the light on 24/7 for heat? If so, a water heater is def a better alternative.
Penelope - Yeah not cool to hijack a thread, but i'll let it slide cause you're cute
Just don't keep replying or it will be an "official" hijack.
You could leave the light on for a few days, but i don't see it making a big difference. Just make sure the turtle has both UVA and UVB and proper basking spot.