A/C Charge by Myself

DIY vacuum pump from an old fridge. Will pull 27" Hg. Not mine but I have same pump on bench waiting for a day of brazing fittings on it.
DISCLAIMER >>> this was just an experiment, No one is going to recommend doing this<<<
I know the acid issues but I did my Breeze with a mighty vac (no kidding, took me like 20 minutes of pumping) and a can of propane. the A/C condensor O-rings were bad so I replaced them. The system had already vented so I decided to see if I could actually pull a vacuum and hold it, sure enough it did. so then I popped the might vac connected to the makeshift hose that was cut off an old R-134 recharge can off the low side connector and chucked the same hose to the end of a propane torch with a pipe clamp (Sanford and Son music in the background) and attached to low side connector. I then started the car and turned the A/C on which didnt energize the pulley becasue there was no pressure in it. I turned the valve on the torch and in about 3 minutes, the A/C kicked on! I kept filling it until the disposeable fill can valve told me to stop. Darn thing was blowing pretty cold air again! I scrapped the car soon after but I wonder how long that would have worked...