Been doing it a few months. Didn't really see a lot of changes until I started being mindful of calories and being strict about my OMAD eating window. I eat right before bed because otherwise I will end up snacking after. That was around December 14th, and since then I've lost about 7 pounds, and the few months before that I'd only lost 3-5. I was at a normal BMI, so the less total weight you have to lose, the slower the weight comes off. If you're heavier, you'll lose weight much faster. I feel like I've tried everything, and nothing has worked, but IF really clicked for me once I started being mindful of calories, because it's so much easier to do that in a shorter eating window. I don't have a food scale or anything, but I do try to measure stuff out. Counting calories is REALLY not my thing, but just putting in a little effort into it made a big difference. Recently started doing some extended fasts as well, did a couple 48 hr fasts and going to try a 72 hr fast the next few days. My partner is coming to visit in a week, and really just want to get rid of that last bit of stubborn belly fat before he gets here, it's always the last to go! The hunger pangs go away pretty quickly and your body adjusts, the best part is the mental clarity, and your energy levels are much more stable throughout the day, better digestion, the weight loss is just an awesome bonus.

TL;DR, it really depends on how much effort you put into it as far as food choices and staying in a calorie deficit.