

Урок идёт один час.
The lesson lasts one hour.
Я жду тебя уже час!
I've been waiting for you for an hour!
Через час я буду дома.
I'll be home in an hour.
"час" is in the lesson "Time 3" (Level 40), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.