48 with a six hour window as in shifting your window by six hours every time? Sounds more like 42/6. Which don’t get me wrong, it is great. Not knit picking just getting a clear view.
If you are starting to fast it is ok to slow down your roll, let your body (heck, your mind) get used to the flow of fasting. It doesn’t need to be a struggle; I was a chronic snacker and now I’m on hour 88 of my current 96 hour fast and I’m not hungry. They get easier, so don’t force them. Else instead of them getting easier, you get used of them being hard.
Consider alternate day fasting. Once you start doing those like a boss it should blunt your morning appetite so 42/6 should be trivial. Eventually you want to do a 96hr fast. Even if that one sucks a bit more it will put anything shorter than that into perspective and make them a lot easier.