How long do you stay in a caloric deficit?

I've been doing it for three weeks. Notice pants are getting much looser. Haven't noticed any strength loss or muscle loss. Endurance at the gym is good. I'm eating about 1500-1800 calories/day. Started at 229 and now weigh 215. Thinking about getting to 205/200 then slowly raise calories to 2000/2200. My end goal is to trim fat and lean up a little bit more.

I've always been able to lose weight pretty good when I get disciplined about it. I'm fasting from 6:00pm-11:30ish am.