Backing a payment out of a target date
A card balance at APR/12 can be cleared by a chosen month with a fixed payment computed from the standard annuity formula: the payment that makes the present value of the payments equal the balance. The months between now and the target are what the formula sees as the term.
The formula assumes interest accrues after each payment, which is how the schedule is then rolled to check it: interest on the balance, your payment off the top, repeat. The table prints that roll so the target month is something you can see happen, not a promise in a headline.