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20 calendar days or more, depending on the next payment cycle which is usually on a Wednesday. If you haven't received it by then, send an email to support@cgtrader.com and ensure your payment agreement is in order.
Depending on when the actual sale was made (perhaps after-hours) and if the 20th day falls on the Wednesday, that the payment may get deferred to the next Wednesday. On a few occasions, (where it has affected me) I have noticed that CGT has missed the pay cycle. Usually those artists send an email directly to support and get this resolved, but some post messages in the forum asking if anyone else has a missed payment. This usually gets addressed the next day or on the next Wednesday.