How long can you run engine without water?

[Adubbs76]

Stupid question but how long can I run the engine without any cooling water running through it? I am planning on fogging the engines this weekend and where I am I don’t have easy access to a hose. Can I safely run long enough to Fogg them?

 

[Cobra Jet Steering LLC]

I run them 30 seconds after flushing them to get excess water out of the muffler if you go too long the alarm will go off and that takes a few minutes.