If you do choose to embark on this, please make sure you’re getting your proper electrolyte supplements and stay hydrated. This is not an easy thing for most people to do. Also, listen to your body, if you feel like things are getting rough then call it quits. Rather safe than sorry in the long-run.
Seconding the rolling fast ideas. Rolling fasts still involve a lot of discipline, and if you end one early, you can just jump into the next one after your meal, less painful than feeling like you failed a 40 day fast.
Also, refeeding takes like half the time of the fast, so you’d refeed for 20 additional days. if you don’t have the money for an er visit in case there are problems with the refeed, i’d say rolling fasts can save money and be way less dangerous!!!