I think they told me 4 hours before your appointment when I called them last week for my appointment. That other person telling you to bring food is not joking with you! You should bring cigarettes if your a smoker and anything else you might need for a very long stay. I was there 18 hours! I showed up 2 hours before my appointment which they were late putting me in the door for and they did not finish loading me and tell 16 hours past my appointment.
You can check in at any time but you better have food with you
There are truck stops right down the road... I didn't sit that long after appt time but chose to take my break at the truck stop instead of the parking at bolthouse.
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