

В течение дня я пью много воды.
During the day I drink a lot of water.
Ответ придёт в течение трёх рабочих дней.
The reply will come within three business days.
Вы можете оплатить заказ в течение часа?
Can you pay for the order within an hour?
"в течение" is in the lesson "When" (Level 42), along with 11 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.