Are we talking full on detailing or weekly wash and vac?
I spent 4 solid days on my Mk6 when I first bought that. My Misses took the kids away to her Dads for a long weekend, so I had 100% uninterrupted time. That included a full clay, machine polish, seal and wax, wheels off to clean under the arches and the insides of the wheels (sticky remains of old balance weights etc)
A normal wash for me (if it's not raining) takes around 2 hours to wash and dry, then around an hour to vac and baby wipe the interior and wash the rubber mats.