Originally Posted by Soksta

Would be assuming a good couple of hours just in labour (ie fitting downpipe, exhaust, intercooler etc) and then a few hours to work on the tune.
Would estimate 4 to 6 hours.
Train/bus/taxi back to the city or nearest (hopefully) large shopping centre and do some shopping, eat something, buy a book and read it, watch a movie, etc.

Best of luck with the tune!

Edit: assuming that they are installing the dp/exhaust.
Would still say at least 4 hours minimum.