[tinydancer]

Five weeks sounds about right to me. The final week before opening is "hell week" when you put it all together and add the orchestra. I've been in several where the choral rehearsals started a couple of weeks earlier than the staging so that when we went to the stage, everyone knew all the songs. That helped a lot. I'm not as sure about the orchestra - I'm thinking they might not need as much time as the actors. Hope this is helpful.