Most, but not all, credit accounts (loans, credit cards, utilities, etc.) report to at least one of the three major credit bureaus on a regular basis. But since lenders aren’t required to provide this reporting on a specific schedule, each lender does it at their own cadence. So, your credit score can change frequently based on how much new information is received over a given time period. The more credit accounts you use, the more often data are reported, and the better the chance that your credit score might change in the short term. In certain cases your score could change daily.
For purposes of your free credit score1 in U.S. Bank mobile and online banking, your score is updated once per week upon log in, which is based on the date you enroll in the service.