I went there as a walk-in arrived at around 10:00 a.m. and they called me in at around 12:00 noon but that depends on which office you're at and whether somebody called in sick or not but you're looking at a maximum of 2 hours if you don't have an appointment it could be less but I've never heard them go over 2 hours waiting time
If you can't find an appointment online or calling them, then you can go as walk in but you have to wait. The wait is not usually long unless you go at peak time
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