If you're not in danger of the 180 day rule (credits expire in 180 days), wait until the end of the month to cash out. If you cash out on the 1st of the month or the 28th of the month, you will receive your cashout amt on the 20th of the following month.
If you are close to having credits expire, you can wait until they are within a day or so of expiring (and you have $25 with 15 in offers) and then request withdrawal. Once your request is in, your credit change status to "pending withdrawal" and they won't expire.
I suspect, tho, that if your withdrawal request is denied (because some credits were reversed), then those credits would be subject to the expiration rule and you' could lose them. Helps to have a cashout amt in excess of $25 to avoid this problem.