May it stand for all time!

4 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 00:50:54.602 in the DVD version of the movie.

Quote context

[...]

- Oh, tonight is the town festival. I wouldn't dream of having you work on my telescope during such an important occasion. You are planning on attending, aren't you?

- Well, actually, ma'am, I don't think...

- Yes, of course, the festival.

- Well, in that case, I'll see you this evening at the festival, Emmett. Mr. Eastwood.

- Ma'am.

- Thank you for taking care of my telescope.

- You're quite welcome.

- It's a nice telescope.

- Ladies and gentlemen, as mayor of Hill Valley, it gives me great pleasure to dedicate this clock to the people of Hill County!

- May it stand for all time!

- Tell me when, gentlemen.

- Three! Two! One! Now!

- Let the festivities begin!

- You know, Marty, in a way, it's fitting that you and I are here to witness this.

[...]