BHO Oven Vac Purging "Pump" Time...???

Hey All.... so i Have the Best Value Vacs Heated Oven.. So im just wondering do i have to leave the Pump on Purging the entire time or just to get it up to 29" pressure and just seal it off and leave it be.. i mean people say hours and days but is that hours of it being purged with the pump on running or is that just at the set 29" pressure.. hmm anything would help... much love all...
 
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