They can last for a few hours up to weeks at a time. Also within this time frame after quitting, convulsions or seizures can occur, which is the point at which alcohol withdrawal can become dangerous if not medically treated. The symptoms may progress to delirium tremens (DT's) after three to five days without alcohol.
I would like to add that in US most of Instrument Ait pressure is 20-25 psi in the system and Plant (Service) Air pressure is 80-120 psi (about 7 atm). Both system require dryers, filters and some other equipment to do air conditioning.
Plant air is the mixture od O2, N2, dust, dirt used in the plant. and instrument air is the mixture of dirt, dust, N2 and O2, used in the isntrument. 3) why are both forms of compressed air required. on this one you better tell me when you get a good enough reply...BUT for starters...