

The lesson is one hour long.
[ðə ˈlɛsn̩ ˈɪz ˈwən ˈaʊər ˈlɔŋ.]
I'll be back in an hour.
[ˈaɪəl ˈbi ˈbæk ˈɪn ən ˈaʊər.]
Is an hour enough for you?
[ˈɪz ən ˈaʊər ɪˈnəf fər ˈju?]
"hour" is in the lesson "Time 3" (Level 40), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,375 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.