Any appliance/lamp timer will work. I've got one I use for the Christmas lights every year that has two sockets & timer circuits. It sits on my desk at work and charges one channel at a time for 4 hours each during my work day. I set the first one up with a 4-port USB hub and charger dongles for eGo batts and the second for my xtar WP2-II.
Here's a bunch of decent ones on Amazon for reference.
NOTE: This is what happens when techie/computer geeks start vaping.![]()
Kind of intimidating to use just by looking at it haha