On the Backend of the restriction it is 5000 minutes, It was designed for small business, the reality of a small business using more than 5000 - 800 number minutes is crazy, I wish I had reg customers calling me for 5000 minutes a month... so for 14.95 thats still a great deal, compared to some of the larger companies charging $50 a month for 250 minutes.
You can see the Full Terms of Service ==> Here
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What if I need more?
you can add another number for 9.95 a month and get another 5000 min, and you may choose not to even use the second number, just use the 10,000 minutes in the bucket