Thanks Jon.

I can't hover over them all day, I'm too busy and I've caught them on the computers after we've all gone to bed as well.  I do have an access restriction rule set up that turns their internet off at certain times in the evenings during the week and at a different time on the weekends, but that's not what I'm trying to do with this request.

If I say to them you can use the internet for 2 1/2 hours an evening and then to the garage to do some work or whatever it is I'm currently doing I can't be keeping track.

But what should they be doing otherwise?

Anything.  My son will spend every waking moment on his computer if I let him.  I just put up his basketball hoop, go outside, get some fucking sun son!  Do your homework!  Help me with projects!

Do you ask him to do these things? Sounds like he definitely needs a hobby of some sort. 

If it helps, I basically the same. The only real exception was cadets which was a huge exception, admittedly.

Anyway, end result is computers pay the bills and I can't afford all of my offline hobbies!

I am too. I'm not the driving force behind this but I am the one who gets to hear about it non fucking stop.