A few days
I got lucky as well for a party of two on a Saturday night. Opentable must have had a cancellation some time on Friday. Otherwise, I'd make the reservation three weeks in advance.
Just call, and you'll know. But preferably as early as possible!
Depends on the day, I got a table for 2 on a Friday an hour before, but they might have had a cancellation
One week.
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