Minimum 10 mins on entry to read and accept proposed terms, minimum 10 mins on completion of parking event to enter vehicle and exit safely. BPA stipulates minimum only as it may take you longer than others due personal circumstances.
The British Parking Association (BPA) Code of Practice (Code of Practice)Section 13.3 “Where a parking location is one where a limited period of parking is permitted, or where drivers contract to park for a defined period and pay for that service in advance (Pay & Display), this would be considered as a parking event and a Grace Period of at least 10 minutes must be added to the end of a parking event before you issue a PCN”
Appealed to POPLA and got them cancelled for various reasons