What does "at seven" mean in English for Spanish?

In English for Spanish, "at seven" means:

a las siete

Listen to "at seven": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 4, Level 3, Scene 5
• English for Spanish 4, Level 3, Scene 6