Depends on the projector, all mfg's have a different spec. I know some people that have 3-4000 hrs on their bulbs. I only have about 600 hrs on my SanyoZ2 and I've had it for 3 years. It mostly is used for movie night, concert videos, and HD sporting events.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85