Quote: Brian Abraham
"One skipper used to carry a 30 minute egg/cooking timer which he used to clip to the glareshield so if everyone dropped off the most they would get was 30 minutes."
Some airlines have built in such "egg timer" in the cockpit, and take it as part of their procedure, that you are only allowed to do control rest if you set your alarm clock (so you're not going to exceed the 20/40 min). Very useful!
Dani