There is a good chance you can see 80% of the benefit by taking only 20% of the time off that I did. Start with a 2 week vacation and then notice how after 2 days you're itching to get back to work on something. Resist the urge, let it build. After two weeks go back to work and find that your first week back is great but don't get demoralized when your 2nd week you find yourself in the same rut. Your weekends are 32 waking hours (almost a full work week) where you can pursue activities that are not work and can be your own vacation (32 hours ~= 40) if you get up early and get out.
If that doesn't work then think seriously about taking 6 months off and see where your hobbys/desires take you.
Good luck!