Answer:
Usually at the end of your school year or the beginning of your next school year
This kind of contract is a<u> unilateral contract </u>
<h3>Unilateral contract </h3>
A unilateral contract is a type of contract whereby only a party in the contract is willing to offer something in exchange for performance of the other party.
In the contract entered between Markel and Jaylin, Jaylin will pay Markel $600 for the painting but does not give Marke a time limit for delivering the job. Therefore the offer is based on Markel's performance and Markel is not fully obligated as well.
Hence we can conclude that the kind of contract is a unilateral contract.
Learn more about unilateral contract : brainly.com/question/25313756