There’s no one definitive answer to this question, as it depends on a number of factors including the size and scope of your operation, the role you’re advertising for, and the level of customer service experience you’re seeking, etc. However, as a general rule, it’s advisable to post your job opening at least two to four weeks in advance. That should give you enough time to sift through resumes and schedule interviews in order to find the best candidate for the role.