I love DIY so I've used that time to refurbish two apartments and catch up on gold rush. This time it's been 8 months and I'm just working on a side project.
By now I'm not enjoying that much anymore. It's been too long and I start to miss making part of the bunch. I'm also not fully using my time anymore, partially because in the end my wife is still working as well as my friends. I believe there's a limit to happiness when you do things on your own and don't share. At least I'm realizing that. I guess it's time to go back!
Also I wonder if I'll still be able to do this when I'm in my 40s or 50s. My parents always taught me it gets tougher to find a job as you get older. Obviously someone that's good will always find, but I wonder in general how aging will apply to tech.
Edit: As a follow up thought and this is what I've realized, the weekends are a pretty good picture of how we'd behave at retirement. If we are lazy on weekends, we'll be lazy afterwards. If we keep ourselves busy in the weekends with non work stuff, we'll probably be the same after retirement.