have 3 speckled sussex that are approx 20 weeks and three each of barred rocks and buff orps that are 18 weeks. no eggs yet. the BR's combs and waddles have gone bright red in the last week or so, so i suspect they are close. the SS are also starting to redden up some, so they might not be far behind. the buffs look to be the last to join the game. of course i just moved the whole flock to a new home, so that might have set the whole process back some.