What does "three weeks" mean in English for Spanish?

In English for Spanish, "three weeks" means:

tres semanas

Listen to "three weeks": (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 1, Scene 4
• English for Spanish 3, Level 1, Scene 8
• English for Spanish 3, Level 1, Scene 9