if you go in when the big hand is on the 12 and the little hand is on the 9 (and its very light outside which means that it is the morning) and Norman (he is the storeman) is full of the joys of spring your boyfriend should be out by the time that the big hand is on the 6 and the little hand is in between the 9 and 10 (and its still light outside).
If Norman is a little grumpy-poos then expect your boyfriend to go in when its light and out when its dark clutching a bill for the missing items of clothing that he sold on e-bay.
The timescale is variable dependant upon the physiological demeanour of the Logistics Procurement operative who is facilitaing your case and wether you have mislaid/misplaced/cast away or in any other manner made irrecoverable any item of tax payers goods that have been given over to your care during your time in service.
The whole process took Mr Ripper a total of 30 minutes to complete but the duration of your interaction with the aforementioned Logistics and Procurement operative may vary.
Hope that helps.
Of course you could have shown your other half the original post and if s/he is really serving it would have made perfect sense.