Our's were 22 weeks Wednesday and we got our first eggs Monday this week.  We have 11 RIR and 11 BR and are getting only one egg a day so far.  Every morning I go out to feed and water them at about 7:00 and every day since Monday there has been one egg.  We have six nests, three up and three down.  There have been two laid in the upper nests and four in the lower nests.  Four of the six so far have been laid in nests with golf balls.  Of the six nests, three have golf balls in them.  I don't know if it is the same chicken or more than one laying at this time.  I have caught only one in the act so far and she was one or our RIRs.