how long should it take to do the swap itself i'm not talking about taking off the front end and putting it back on, but the rerunning of the pipes, disconnections, draining, reconnections and coolant refill...you get the idea
I can't say swapping from a dual pass to single pass (Viggen IC) but I recently switched from a VIC to an aftermarket IC and the fitting took about 6 hours. I think you could do the VIC swap in around 3 without having to do any metal work.
My solution to the tight area you are describing was to bend the A/C (I believe that is what they are) lines slightly and working the hose onto the Turbo. After I did that Dean (Saabnet) mentioned that if you cut the hose approx. 1/2" at the Turbo end it fits much better.
As for time to install, the first time I did it with my '96 900 it took a good length of time, I took my time. The second time around on my '99 9-3 I was able to do it in under one hour, but I did not have to deal with the coolant hose as I already had the bent one.