For mice? I don't know anything about mice breeding, but do you want 4 weeks in between when the mice are ready to be fed? I don't expect you'll be feeding pinky and fuzzy mice are you?

Honestly, if you wanted to do a small operation for 2 snakes, I would harem breed all at once and CO2 them when they are old enough. Just my thoughts.

If this were rats, I could give you better advice.