I was wanting to know how long I should wait until I should try to hatch a clutch to keep the flock going? We have 15 rir. 6 ideal 236 (leghorn hybrid ) 6 nhr. 3 welsummer and a speckled Sussex all pullets as far as I know . They range in age from 3-7 weeks.. I don't want to hatch to many at one time. We mainly got the chicks because the house we are in had an enclosed hutch already built 12 x 16 foot and a run already fenced in its 32 x76. And have 4 acres for them to roam.