I've actually done several of these audits. I've never had them take me more than 6 minutes a pop. I go in super prepared and just knock them all out very quickly. The employee doesn't want you in there longer than necessary anyways. They are happy to push you out the door quickly. It helps if you know what you are doing. The reports are simple, too. I used to stack 5 or 6 of them a day when they didn't limit it. However, I always waited until they raised the pay to at least $20 or more as they inevitably always do because no one wants to pick up something described as a possible "hour-long" shop for less. Seriously, though, you can knock then out really quickly if you are well-prepped to do so. Which frankly makes for a decent payday if you wait for the boost.