In Key v. Naylor 268 Ga. App. 419, 422-23 (1) (602 SE2d 192) (2004), the duration of the contract and the terms of payment were clearly vague and uncertain. The written employment agreement at issue in Key set an initial ten-year term for its duration, but further provided that the employee could "extend her employment indefinitely at her option," and then went on to provide that the agreement was enforceable "even if she was no longer employed by the company." 268 Ga. App. at 422 (1). As to terms of payment, the agreement defined "salary" as the employee's "current rate with periodic increases," with no indication of timing or manner of calculation of those increases. Id. at 423 (1).