When you pause your premium subscription renewal from your Account page what you are doing is delaying your subscription renewal to a future date.
For example, if you subscribe for 1 year on 9/1/2018 and pause your subscription on 1/1/2019, your premium subscription remains active until 9/1/2019. At that time, your premium subscription will pause, or become inactive, until the date you picked to resume (in this example, 1/1/2020).
The amount of time you subscribe for is not a "total amount of time used." The subscription period starts on the day you subscribe to premium and ends after 1, 6, or 12 months after that day, based on the length of plan you select.
You can still cancel the auto-renewal at any time.