(a) The time for shipment or delivery or any other action under a contract if not provided in this chapter or agreed upon is a reasonable time.
(b) If the contract provides for successive performances but is indefinite in duration, it is valid for a reasonable time, but, unless otherwise agreed, may be terminated at any time by either party.
(c) Termination of a contract by one party except on the happening of an agreed event requires that reasonable notification be received by the other party. An agreement dispensing with notification is invalid if its operation would be unconscionable.