For subscription plans minutes are refreshed each day at midnight in your local time.
The daily limit must be used each day, or else it will be refreshed the following day. We designed our plans this way to promote daily practice, as the best way to improve your English is to practice every day. However, we understand students may miss days due to busy schedules, so we price our daily plans very low. Even if you miss 3 days a week, it still is a better value to purchase a subscription rather than prepaid minutes!