I just checked my T*mobile cellphone account to see what minutes I have left and when those expire. In the Account Settings, there's a display of the general parameters:
Rate plan name: Pay As You Go
Minutes included: 132
Messages included: 137
Plan expiration date: 12/31/9999 11:59:59 PM
Date/time of next plan charge: N/A
Balance available until: 5/26/2010 12:00:00 AM
Nice to know the plan is good until the year 9999. I was worried it might only be in force for a decade or two.
And when the far-off rolls around, someone will point to your bill as evidence that the world will end, as the far-seeing inhabitants of the 21st century foresaw!