Bed LED delay switch?

I got some LED's that I want to install in the bed. I'd like to get a switch near the tailgate to turn them on, even if the truck is not running.
I'm also dumb, so I'll probably forget to turn them off and drain the battery at one point. So I'm thinking if I can install some sort of timer, that just runs for 10/15 minutes and then shuts off?
I found some things online to that effect, but before I try this: does that make sense at all?
Has anyone done this? Any recommendations for the switch?
I'm also pretty sure there is no permanent hot wire in the bed, so I'd need to run that as well.

 

I don't know about the timer but @mattgecko makes a kit for LED lights that go under the bed rails and work great. The kit comes with a pin switch that gets installed right near the tailgate.

Here's mine from when I did the install a few years ago.

 

Do you have the factory squid launcher bed lighting switch next to the steering wheel? The factory bed light kit can be turned on any time from there once the lights are added.

I don't like cutting into factory wiring if not completely necessary, so if I was in your shoes and wanted a totally separate setup, I'd run new wiring thru a relay and use a waterproof switch mounted in the bed to toggle them. Edit: would accomplish the same look as above. I didn't know someone already made a kit for that.