These are maximum periods for bringing such actions, measured from the time the employee's cause of action accrues to the time his action is commenced.
Conference Report, pp. 13-15.
In some instances an employee may receive, as a part of his compensation, extra payments under incentive or bonus plans, based on factors which do not permit computation and payment of the sums due for a particular workweek or pay period until some time after the pay day for that period. In such cases it would seem that an employee's cause of action, insofar as it may be based on such payments, would not accrue until the time when such payment should be made. Cf. Walling v. Harnischfeger Corp.,325 U.S. 427 .
29 C.F.R. §790.21