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The air compressor will start to work as soon as the engine starts to spin. It will continue to compress air into the system until the governor cuts out, which should be 110-130 PSI with 120 PSI being ideal. It should cut back in when the pressure drops to 85-105 PSI with 95-100 PSI being ideal.
Depending upon how many auxiliary systems and tanks are on the bus it should take no more than 3-5 minutes to go from 0 PSI to governor cut out @ 120 PSI.
Low air buzzers, lights, wig wags, etc. should activate no lower than 60 PSI (and should go off once the pressure goes above 60 PSI). Some wig wags need to be manually reset once the pressure goes up.
Spring brakes should apply whenever the air pressure drops to 25-45 PSI with 30-35 PSI being ideal.
As far as driver's licenses are concerned, as long as the bus has been retitled as an RV you will NOT need any special license to drive it regardless of how much the GVWR is with certain exceptions. Driving in Canada, western Canada in particular, requires having an air brake endorsement to drive any vehicle, commercial or private, if the vehicle has air brakes. In British Columbia you will have to stop at the Port of Entry. If you do not have an air brake endorsement and your vehicle has air brakes you will get red tagged and your vehicle will NOT move until a driver with the correct endorsements is available to drive. There are thousands of RV's on the road today that are converted buses, medium and heavy duty trucks, and converted semi-trailers and none of those drivers are required to have any sort of special license or endorsement on their license.
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