Here I cite reddit posts, not literature, because /r/fasting has a lot of good anecdotal data, and many weight loss studies are limited in scope.
The answers to any of these questions will likely depend on your starting weight.
On Question 2: In theory this is just a function of your BMR (basal metabolic rate) and TDEE (total daily energy expenditure). For example, if you are large enough to have a TDEE of 3000kcal, then you will lose 1lb of body mass per day (how much is muscle vs fat unclear).
In practice this is a bit of an overestimate. For anecdotal success stories you could go to /r/fasting. On Top All I see:
104lbs lost in “4 months” (14 day fasts followed by 5 days keto at a slight deficit) = 104lbs in 90ish days of fasting (morbidly obese man)
90lbs lost in a 40 day water fast (morbidly obese man)
Many (often smaller) people doing OMAD, rolling 48, etc
Searching for “14 day” I see: (keep in mind, about 10+lbs of this is water weight)
23lbs in 14 days
30lbs in 14 days
25lbs in 14 days
Common wisdom on this subreddit is you get 0.5lbs/day of “real fat loss” during an extended fast.