1995 p38 compressor advice please

After disconnecting the outlet pipe on the air compressor and having the engine running what would be the average time that you would be able to hold your finger over the outlet pipe before the pressure built up enough to cause resistance to move your finger off. Can you please let me know as soon as possible as I have a garage mechanic on standby today please?

You should not be able to hold your finger over the pipe as soon as the pump starts, if you can hold your finer over at all the seal has gone and pump wants rebuilding its a simple diy job
try to keep tech questions in the range rover section it will help get the answers quicker.

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