Walk in. Usually (if not busy) half hour.
I think if nobody waiting, just take half hour. If somebody waiting, Probably take an hour. If long line, that may take 2~3hours. Depends on how many people right on the line. Normally they pretty quick. And just walk in will be fine.
Slow leaks are often because the rims corrode. just walk in and they'll take a look.
Usually you can just do a walk in with an item like that. Depending on wait times, it could be fixed immediatley or there could be a wait.
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