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Once it cools, it should function properly again. A lava lamp may overheat in eight to 10 hours, depending upon the bulb and brand of lamp. Use the lamp for less than eight hours at a time for best results, allowing it to cool to room temperature before using it again.
Carl, it depends on your definition of very long.. But generally speaking, a LCD projector lamp should last between 2,000 and 3,000 hours of viewing. That holds true for a Home Theater lamp or a lamp for a DLP TV. Of course, that number can vary. Like any kind of bulb, it might go dead in fewer hours than that, or it could last even longer.