"You wait until six."
Translation:Aspettate fino alle sei.
It seems that Italian numbers are neither feminine nor masculine because they describe the noun.
These are some rules regarding usage of definite aricle with cardinal numbers (uno, due,... dieci,..):
The masculine singular definite article is used with years and days of the month:
- è nata nel 1965.
- il trenta di maggio.
When the question is che ore sono? (What time is ti):
- è l'una = it is one o'clock (all others are preceded with feminine plural definite article)
- sono le tre = it is three o'clock.
The way I understand it is that you use le for numbers when telling the time because "ore" (hours) takes 'le'. (except for one o'clock which takes a singular article (l'ora)). The word ore is not included in the sentence but it is assumed. ie. Aspettate fino alle (ore di) sei.
Similarly year (l'anno) and month (il mese) are masculine hence use of the masculine article.