When using a HFC-134a refrigerant recovery machine after completing the first recovery process how long must you wait then check the machine's gauges for a rise in pressure above vacuum which would in?

After completing the first recovery process using a HFC-134a refrigerant recovery machine, you should wait about 5 to 10 minutes before checking the machine's gauges for a rise in pressure above vacuum. This waiting period allows any residual refrigerant to stabilize, ensuring an accurate reading. If the pressure rises, it indicates that there may be a leak in the system or that not all refrigerant has been recovered.