Approximate time from N-400 interview notification, to interview

[NettieL]

My family member's USCIS update, is that their interview notification was sent in the mail, yet they hasn't received it.
How long does it usually take between the notification of the interview, and the interview.
This is at the Tampa, FL office.
Thank you.

[NettieL]

From what I've read on Immihelp, it looks like round and about a month.