I have a habit of watching what a mechanic does. I try not to get in the way or be overbearing, but try to BS with the guy and ask questions. Anytime I ever had a nail in a tire, the guy always pulled the offending piece out, took the tire off the rim, inspected the interior for anything else that may be in there, informed me one way or the other. If there was cord damage on the inside, your looking at a new tire. Otherwise, he puts a plug in the nail hole and maybe a patch on the inside. If he knows what he's doing, he'll even mark the tire in relation to the way it came off the rim prior to inspection to ensure that the wheel weights are in the right place when he puts the tire back on.
A good job should take 20 minutes to half an hour.
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