It really depends a lot on your current weight, how you fast and what you eat during these months.
For. eg. Refined carbs will slow down or not help your reach ketosis depending on how much you eat.
The key to stick here is less calories in / calorie out - calorie deficit.With all that said the recommended weight to loss 1lb a week, reach out to your physician if they don’t match your goals.
Add some HIIT during your fasting state, walks to help the calorie deficit. FAQs has more info about these.
If you fit in 3 meals and snacks in that rather large eating window, probably not alot.
If you are munching all the time on crappy food now, probably some.
Try for 16/8. Start easy and up the hours a little at the time.
Is this 22lbs to your ideal weight? Then it will be very hard to lose even in 3-4 months. People who quickly lose 22lbs in a single month start at 300lbs and end up with 278. When you’re overweight you lose initial fat quickly because your metabolism is working as a hot oven, burning calories to feed all that extra body weight. But when you’re close to your normal weight the same 22lbs become a struggle as metabolism doesn’t do you any favors anymore and you need to either burn these pounds yourself (exercise) or go on a very strict diet (calorie restriction). Try starting with 16/8 Fasting when you only eat during 8 hours period in every single day. Also remove any snacking from your diet. If you constantly munch on food during those 8 hours then you’re not really dieting. Watch what you eat. Restrict your carbs (bread, pasta, pizza, sugary drinks, soda, juice, etc.) and you should see a small progress. But don’t expect miracles.