You can always find a ZWAVE or perhaps X.10 controller and a bunch of slaves to do this.

To put it another way, sometimes the garage lights get left on by accident for a couple of hours. There are several bulbs. I'd like to have them go off automatically after a time period, but I don't want to change all the switches. I suppose even though there are 6 switches, only two or three of them are the ones that would tend to be switched and then forgotten.

Put the timer in the first light fixture in the chain.

Thanks, what kind of timer goes in the light fixture rather than in the switch?

sounds like you need a motion sensor on the lights..
on with a time delay with the light on..

something like thats used on an outdoor light.

-dkenny

No, what I want is a device that I could install in place of one switch and would work if any of the switches are used on that particular string of lights. Does that device exist?

thanks

The occupancy sensor would have to be in the space you want to monitor. Can't say I've seen "switch" device that works alone in a multi-way situation.

Frankly, as suggested, you be better off using an independent sensor placed between the switches and first light fixture.

Will that turn on the light when I operate one of the two switched in the house?

You set it up so that when the light feed is energized the light comes on immediately, and then hold the light on for a delay after the light feed is removed.

It is easier to do if you have an unswitched hot line at the first light to make sure the timer can run on a time delay relay.

Ah, I now see what you guys are talkin' about.