Rockers are fed by returning oil. They can last for quite some time just on mist.
With no scavenge happening the sump would fill/tank would empty in about 10-15 minutes at idle. At about the 2-3 minute mark she'd be smoking, after 5 minutes she'd be creating puddles, doubt she'd run with a full gut of oil.
Cheers
ps, anytime I have the sump plate off I give the pipe a squirt or carb clean.