[saluki]

Going back to your boss . . . not recommended . . .

y, most likely you're never going to convince your boss that you're only productive 3 or 4 hours per day . . . if anything you'll be bringing scrutiny on what you accomplish daily and possibly lower reviews/raises/advancement.

Very few companies are open to anything less than 40 hours per week or even 4 day work weeks.

I would put your efforts in to finding a company/boss that does or work on starting your own thing in your extra time.

Good luck in 2016, fight the good fights.