Hi Andrew:
I could do that in a few hours, day at most so I don't know about 2 weeks.
I didn't have to re-do all my post-conversion work thanks to Bob W's suggestion and everyone else's much-appreciated weekend assistance. Just did a convert to 9.1 then to 9.2 which didn't take long on my SSD and copied in 6 files.
The bad part was that the client found the issue and had to start re-entering almost 500 Distrib. codes. He did about 100 until I told him I could fix it. Makes us all look bad. It's fortunate he did find the issue in my last round of testing the conversion because they have a real production environment and add many new customers a day (you know them, 27k customers) which would have stopped them without Distrib. codes.
I understand about not finding the bugs but my goal is a smooth conversion with as little egg on my face as possible.
I will do the live upgrade tomorrow.