If you go into options, hold enter down whilst OSD is highlighted and then go down to selfcheck. See the thread below for an example of how the timer's are shown.
Panasonic pt-ae500 brightness flicker
You can add up the total runtime for all lamps that have been installed up to a maximum of 3 bulbs IIRC. You can even find out hown many on/off cycles the PJ has had.