As a freelancer, you should track what you worked on when and for how long. If the client comes back and says "you billed me for 4 hours yesterday, what did yo

As a freelancer, you should track what you worked on when and for how long. If the client comes back and says "you billed me for 4 hours yesterday, what did you do?" During that time you might not have something presentable yet, but you need to track what you did (which might be 'write unit tests for {featureName}" With that said, I'd hate getting interrupted every N minutes. Personally, at the end of a work session, I stop my clock (I bill by the hour) and note any PRs, meetings, or glue-work I did during the work session.