
Easy. 40 weeks from the date
of her last PERIOD.
The Big Bang Theory Season 11, Episode 16

Period.
Breaking Bad Season 2, Episode 7

We based this park
on Japan's Edo PERIOD
Westworld Season 2, Episode 5

...requires public hearings
and a 60-day comment PERIOD.
The Big Bang Theory Season 4, Episode 21

Well, he used a PERIOD
instead of a question mark,
The Big Bang Theory Season 9, Episode 16