I did mine today.

Conditions
1. Air temp 48F
2. Engine moderatlely warm after driving about 6 miles.
3. Car is 1983 300D, 617 engine, federal version. Main vacuum line not blocked off. Car has just short of 311,000 miles, original unrebuilt engine, minimal oil useage between changes and no smoke.

Results

The bag filled in just over two minutes.

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.