In T2, John Connor asks the Uncle Bob version of the T-800 how long he'll last. The T-800 responds by saying that he will exist for 120 years with his existing power cell.
Is there anything within the Terminator canon which states how long the other terminators would live - er, last - before failing? Other versions of the T-800, the T-850, T-1000, and T-X are the terminators in view here.