FICO Score 9 updates as often as the underlying credit data changes. The credit bureaus, such as Experian, Equifax, and TransUnion, update their credit reports regularly, usually at least once a month.
When a lender requests a credit score, the score is generated based on the most recent credit data available. So, in general, the more often a person checks their credit score, the more likely it is to be up-to-date.