Security Deposits – As an owner, how many days do I have to return a resident’s security deposit after move out?

Civil Code Section 1950.5 requires that within three weeks (21 days) after the resident has vacated the unit, the owner must furnish the resident with a copy of an itemized statement indicating the basis for, and the amount of, any security received and the disposition of the security, and the owner must return any remaining portion of the security to the resident.