It is 30 days notice from the end of the billing period which can be a lot more.
If you do so within the billing period generally, 15 to 45 days you can avoid paying any interest on it.
You will continue to have the same access and benefits of your product for the remainder of the current billing period.
However, if you cancel in the final 30 days, the cancellation will not take effect until the end of your current billing period.
It is standard practice for Classmates.com to auto-renew memberships at the end of each billing period.
This is the interest rate used to figure the finance charge on your balance each billing period.
If the auto comes back in good shape, a credit is entered, but this may fall into the next billing period.
But for a billing period of 31 days, the order is reversed ( is less than ).
The last date on these is about ten days ago, but I guess that was just the end of the billing period.
They would then pay off their balance at the end of the billing period, thus incurring no interest charges.