Will 1 hour of playing ps3 on a toshiba 52hmx85 5 days a week ruin the TV?

May be...

Also will the lamp in the TV run out faster? If so, by how much?

why would playing a PS3 on your TV kill the lamp but not using it to watch TV?

your fine, I play 9 hours a day on the weekends on my HD and its fine.