I keep harking back to our hunter/gatherer ancestors, who must perforce have had to fast for unpredictable periods.
So I like to mix it up with 24hr liquid only fasts - sometimes followed by a VLC meal, sometimes by the full 600 cals, very occasionally by turning it into a 36 hour fast.
But when I started IF I could never have imagined doing this. I even worried about missing breakfast when I had to do a fasting blood test at 9.30 in the morning!
So I started with three small meals a day - but I noticed, after a while that I wasn't hungry when I woke up. Eventually, after several months of doing this, I thought I wouldn't eat until I became hungry. To my surprise I went right through until dinner in the evening - without feeling the slightest hunger pang.
The body needs time to adjust to fasting, it's true, but it doesn't take long.
And look at all the health benefits! 
BTW, BC, I regard 150 calories, if it's done properly, as a full meal, not a mini-meal! 
My record is a 75cal veg curry!
Just think what you can do with the other 425 calories! 