I was thinking about this myself. I think I may do 1 week of a 7 day fast and then a few rolling 42/76 hour fasts for six weeks until I restart the cycle.
I think the 7 day fast will give me the cellular benefits and the shorter fasts will help maintain weight.
I am testing the benefits as far as weight loss between the two. I did a 14 day and lost 20 pounds. I did a 5 day refeed and then rolled into a 5 day fast with a 2 day refeed for 3 cycles. Tomorrow will be the 14th day of this cycle and I will be down between 14-15 pounds. I should be 15-17 down for the full 15 days. The 5 day rollings with a 2 day refeed has been much easier for me.