This is entirely dependent on the amount of items there are to be appraised. Sometimes it can take only a few days for a certified appraiser to deliver his/her report other times it can take months. The more items to be assigned a value, the longer and more costly the appraisal(s) will be. Always make sure to plan accordingly, since there is no way to estimate how long the appraisal will take before the appraisal begins.