You can leave an air mover on for as long as needed, often continuously for several days to a week, because they are designed for continuous duty operation. In professional water damage restoration, it is common to leave air movers running 24 hours a day for 3 to 5 days straight until the structure is completely dry, as verified by moisture meters. Their motors are built to handle this extended runtime, with thermal protection that shuts them off if they overheat. For home use like cooling or ventilation, you can leave them on 24 hours a day for months, just like a regular fan, though you should periodically check that the intake is not blocked by dust or debris and that the cord is not hot. Most manufacturers rate their air movers for continuous operation for thousands of hours. The main limitations are not motor life but electricity cost and noise. A typical air mover draws 200 to 800 watts, so running it continuously costs about 5 to 20 cents per hour depending on electricity rates. For water damage, do not turn it off at night or when you leave, as interrupting drying can cause moisture to resettle and increase total drying time significantly and raise mold risk. After the area is dry, you should turn off and clean the unit before storage to prevent dust buildup.
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