What does "around five-thirty" mean in English for Spanish?

In English for Spanish, "around five-thirty" means:

Sobre las 5:30.

Listen to "around five-thirty": (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 3, Level 2, Scene 11
• English for Spanish 3, Level 2, Scene 12