Usually a good General Delay is 100ms or 0.1s. Power On delay for most devices will be 7-10s.

I have never used any of these delays as they prevent jumping from page to page during execution (I use startup animation macros with progress bars, etc...).

I avoid the Power Delay simply by naming my functions POWER_ON (does not match the name PEP is looking for). I believe I also use KEYPAD_0... KEYPAD_9 to avoid the General Delay as well.