If you are an artist who accepts commissions, you need to learn a very important term: SLA (Service Level Agreement). Don't know what it means? Alright, I'll tell you!

An SLA is a part of a service contract where a service is formally defined. In practice, the term SLA is sometimes used to refer to the contracted delivery time (of the service or performance).
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In simpler terms, it spells out how long you have to complete your commissions per specified guidelines. You should post your SLA with all your commission info.

Take this from someone who knows what commission prices and delivery times are about.

This may be good info to learn before you start doing business/professional works. Thanks!

Apollyon