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i have done it a couple times, 20m to pull the manifold, 45m to pull the rest of the system. reinstall manifold 45m max, install new system depending on what is needed. i always do this on a lift. and i have all the tools need to do this. plus extra stands to support the exhaust system as im pulling or installing. having an extra hand or 2 is always good if you dont know what you are doing.
It took me 6 hrs to install header and full catback. I did it using jack stands and took my time since I hadn't done this on a mini before. Not a particularly difficult job - just take your time.
A few hours, up to a day depending on fitment issues. If your aftermarket header or exhaust doesn't bolt up perfectly, you could be looking at minor or major delays according...
i did mine without know how in a couple of hours maybe 3 at most. i had trouble with the heat shield behind the manifold but i just wiggled it around and was able to get it out.