It would take less than 2-5 minutes or less in my cabinet, depending on the paint (both sides of a 2x2 plate of metal). I'll check the pressure setting, but I would guess between 60-80psi.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.