Minutes are counted based on the length or duration of the Track generated. For example, if you create a 30-second Track, that counts as 0.5 minutes towards your plan. If you create a 2-minute Track, it counts as 2 minutes. 

The duration of each Track will be attributed towards your minutes consumed under your Subscription Plan, until the earlier of you exhausting all subscribed for minutes or the end of the duration of the Plan.