My name is Paul, I have been in the Coast Guard 25 years and am stationed in Kodiak Alaska. I have a 33 ton Carrier onboard my ship. The system had a leak on the TXV, we took care of that and stuck the system on a vacuum after evacuation. We have brass caps that cover valve stems. All of our valves leak as we discovered this morning. We came in and found out that our system had not pulled down at all, it was still at 5000 microns. We put balloons on the valves and watched in horror as the balloons collapsed. So, we have been pulling 22 degree air and moisture in all night long. How long should I expect the vacuum pump to take to pull it down to 50 microns?