Welcome to IFing! One of the great things about it is that it's so flexible. Skipping even one meal as you would be doing with a 10 PM - 1 PM fast is still IF.
This week I've been doing one of the IF patterns that is promoted in some book I forget, maybe Eat Stop Eat, which is to eat breakfast and lunch, then nothing until dinner the following day, then breakfast and lunch the next day, and so on. I don't think I'll keep that up for more than a week or so. Then I'll go back to my usual pattern of skipping two or three meals in a row, twice a week.
But I think if you haven't done IF yet, then it is a good idea to take baby steps. You seem to have the PB way of eating down pat, though, so I doubt you'll have much discomfort.
You lousy kids! Get off my savannah!