Susan, I'll just chime in on the areas that I know about...
As far as edit time, the answer is always "it depends". But for an hour-long piece, it would be very wise to budget in at least 12 months of editing just to get to picture lock. That time period includes all logging, capturing, initial viewing, and then editing. If you have 60 hours of footage (i.e., a shooting ratio of 60:1), then I think 12 months of editing is a decent estimate. If you have less, and are super-organized, then it is within the realm of possibility to get to picture lock in 9-10 months. If you have 100+ hours of footage, I think you'd be well-advised to plan on 15-18 months of editing.
A lot of the schedule also hinges on the type of footage you have. If it's all observational cinema verite moments, then that usually takes longer. If your documentary is 100% interviews with b-roll laid over the top, then that generally takes a shorter amount of time because you can script out your scenes much more easily. Since you said that you have a lot of music in-camera, it sounds like you may have a mixture of observational and interviews, with a lot of live performances mixed in.
As far as each editor's dayrate, most of the people that I've worked with operate on a 10-hour day. Of course, a longer day can be negotiated (or you can be overtime), but on such a long-term project, I don't think you want to burn your editor out by insisting on 12-hour days. (And eight hours is barely enough time to get started...)
Regarding GFX/Credits, that depends on how complicated a sequence you want to make. For simple opening and closing credits though, I wouldn't budget out more than 3-5 days. A lot of that will simply be you as the producer/director tracking down the correct spelling of all the names of your subjects, donors, crew, and technical team. The actual editing time is quite minimal, and just involves making adjustments here and there to make a crawl smoother, or add in more names to the credit roll.
Hope that helps!