first one always takes longer. So I would say 2 hours for the first one, an hour for the second, and 30-40 mins for the last two.

Budget a saturday and if things go well you'll be done with time to spare.

__________________
2006 Audi A3 2.0t DSG apr stage 2
2002 BMW X5 4.4
1997 BMW 328ic sport. moreagrun metallic
1989 BMW 325is with / M50b25nv swap