After eating only dinner for years, a month ago I found myself eating every other day (except for two pieces of fruit in the afternoon) and I feel even better since then? Where is the limit?
This is also just an evolutionary form of the appeal to antiquity fallacy. I might also point out that we have no clue how early humans apportioned meals throughout the day.
I'm again not trying to say anything about YOU, only cautioning other folks here that the intermittent fasting trend among tech folks looks a lot like social trends among other populations that turned out to be very unhealthy and that people should be cautious.
You lose roughly ~0.75 lbs of body fat at normal fasting levels assuming a reasonably active regular sized person. So how ever many days worth of body fat you would like to gain and lose regularly. You would have to eat back the same amount and probably wouldn't want to gorge yourself too much. A reasonable practical limit might be 5 days.
All of that assumes that you want to maintain a set weight. So the real limit is how much you want to eat in a single sitting. Take those calories and average them across as many days as needed to maintain weight.
Also, the 450 pound (204 kg) man who did not eat for an entire year [0] lost 0.72 pounds / day.