I almost always have a bonsai re-veg in my veg closet. Gives me as many clones as I can use in about 2 weeks. I like variety, so I usually replace with a new bonsai mom (different strains) every month or two.

If you are going to take cuttings before putting mom into flower, give her a couple of weeks to recover before switching her to 12/12.
Rooted clones should have a couple of weeks of veg time to acclimate to the soil and situation. Sure, you can put freshly rooted clones straight into flower, but actually they will benefit from a veg cycle.