Final answer:
The oral contract in Rooney v. Tyson did not establish a definite duration and did not satisfy the at-will rule.
Step-by-step explanation:
In Rooney v. Tyson (1998), the oral contract between Rooney and Tyson to train Tyson "for as long as the boxer fights professionally" did not establish a definite duration and did not satisfy the at-will rule. The Court held that although oral contracts may establish an employment term of a definite duration, the length of the specific contract in question was not sufficiently definite.