No, there is no such limit on the number of minutes used per day. As long as you have an uninterrupted active subscription and credit balance you can use without limit.

In case you are subscribed to Gold plan - there is a threshold of 1000 seconds per day for making calls and / or 25 SMS per day as per GOV regulation. Once you exhaust your daily free limit, you will be charged from your current remaining Credits to make calls or send SMS over the daily limits. If you need, you can additionally purchase the credits from Credits screen from the Settings.