Hi there,
I don't think it would be a problem. Have a look at my blog, one of my teeth has an ugly old crown on it, and it doesn't seem to affect the invisalign process at all. I was already planning to replace it at the end of the process. I must say though I am starting to see a black line along the top of it where it no longer meets the gum line properly.
I also worried at first that I would pull the crown out, but so far so good. I am a bit more careful around that tooth not to just yank at the aligner, but then it seems to work fine.
It is impossible to say how long Invisalign would take, sorry, only an orthodontist can tell you that.
Good luck


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