I would doubt that very few people would go to that extreme!
Watched MB pull vacuum at factory on new cars for 45 seconds & then charge them. OF course with all new parts not as much chance for moisture to collect. WE always run vacuum for 1/2 hour & install new drier.
30 years ago when I started this business the time for a *good* vacuum was 24 hours.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)