How long does it take for citations to appear online when someone cites my work?

It depends on the website you are looking for your citation; usually, Google Scholar is the fastest. If someone cites you, it will appear on your Google Scholar profile 24 - 48 hours after publication. Unfortunately, Scopus is the slowest, and adding that citation to your profile may take even one month. That is why we always encourage you to have a Google Scholar profile to monitor your citations better.