Well, with standard eternal, your flame burns only during visiting hours. It is shut down at night.

7 seconds sound clip from the The Loved One (1965) movie soundboard.

You can hear this line at 00:36:34 in the Blu-ray version of the movie.

Quote context

[...]

- Well, then I think that I'll take the... emperor... emperor model.

- Wonderful, Mr. Barlow. Wonderful.

- Now then, have you given any thought to exterior designations?

- I can give you our eternal flame in either perpetual eternal or standard eternal.

- Well, what is the difference, actually?

- Well, with standard eternal, your flame burns only during visiting hours. It is shut down at night.

- With your perpetual eternal, your flame is in service 24 hours a day.

- Well, I think the... Perpetual eternal. Wouldn't you?

- Oh, yes. Yes.

- Propane or butane? Propane burns bluer.

- Oh, well... and nicer, I think. Don't you? Huh?

- Definitely.

- Marvelous. Simply marvelous. Now we'll just along into fittings.

[...]