I don't see how just the 4 subframe bushings can be 10 hours if you have the special tool... maybe 1.5 hours per corner.

what are the doing, dropping the whole subframe and using a real press?

lots of good info so far, keep the input coming.

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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