How many nights did it take for CIO to work? We are heading into night #7 and he still cries for 30-60 minutes (with check ins) before he finally falls asleep. How long did it take before you could put the baby down and just get a few cries/whimpers before they fell asleep? The constant hard crying is killing me, but I'm reluctant to give up because:
a) we still have a problem - he won't fall asleep without a very complicated bouncing/holding/swaying/rocking dance and after all that he still sometimes wakes up when we put him in his crib
b) then I have made him do all this CIO for nothing and will probably have to subject him to it again at some point

What are your experiences with letting them CIO?