Google "extension cord with timer" and you will get hundreds of hits. I use one all the time for the glue gun and many other things.

~Bob

: After a 9-day break, I went to work on my latest strip-built
: project and discovered the glue gun still on. Amazingly although
: the glue was a little brown, it came out just fine. I can't
: believe it didn't start a fire or just burn out and quit
: heating. I am going to look for a gun with a timer on it.