I think 2-3 hours for ONE side would be no problem for one of the experienced techs. But it's probably a little ambitious if you've never done it before. I bet you could do it though (one side this weekend, one side next weekend) if you could get one of the techs to commit to working with you for the whole 3 hours.
I've only done this procedure once on my 201, and it took me all weekend to do both sides. (but I didn't have all the right tools, and you have to factor in the learning curve.) If I had to do it again today, I'm pretty confident that I could do it in one day -- not including allignment, for which I would have to go to a shop.
You could speed up the process with some prep work: have your ball joints pressed in before you start. Same with the new bushings (if they're not already).
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