Most Shop vacs have a thermal cut-off switch that prevents the motor from overheating. This means that the Shop vac can run for an indefinite amount of time, as long as the motor doesn’t overheat. However, it’s always best to consult your Shop vac’s manual for specific guidance on how long it can run without needing a break.
Assuming that your Shop vac has a thermal cut-off switch, you can run it for as long as you need to without worrying about damaging the motor. Just be sure to keep an eye on the vacuum cleaner’s dirt cup or bag, as they will need to be emptied periodically.
Additionally, it’s always a good idea to consult your Shop vac’s manual for specific guidance on how long it can run without needing a break. By following the manufacturer’s recommendations, you can ensure that your Shop vac lasts for many years to come.