FP+ "grace" period?

[buyerbrad]

Do they typically "allow" any sort of pre or post FP+ grace period?

 

[Robo]

Do they typically "allow" any sort of pre or post FP+ grace period?

Entry is virtually always allowed:
5 Min. before the stated start of the window, and
15 Min. after the stated end of the window.

 

[buyerbrad]

If they do let you in 5 minutes early, does that mean in theory if you were to try again during the actual 1 hour window that it would work?

 

[Isildur's Bane]

no

 

[Robo]

If they do let you in 5 minutes early, does that mean in theory if you were to try again during the actual 1 hour window that it would work?

no

Ditto.
Once scanned-in, that FP is considered "used."