Typically, a lamp in an LCD video projector will last in the region of 2000 - 3000 hours. The specification varies for almost every different model of projector and the actual life span depends on numerous factors. Normally, lamps do not fail instantly but the light output will reduce over a period of time. A 2000 hour lamp may need replacing in as little as 1000 - 1500 hours or it may last in excess of 3000 hours.
Generally, repeated starting of a lamp will put more stress on the lamp than continued operation. A projector that is used repeatedly for a few minutes at a time will get through lamps in fewer hours than one that is left on for several hours at a time.
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There is no set time frame. Keeping an eye on your projector lamp and watching for dimness in the images can let you know when it may be time to replace to lamp before it burns out.
Today projector bulbs can last for as long as two thousand hours. If you have an older projector then you will not get as many hours.