Be diligent in describing how the time you have spent has resulted in a benefit for your client. I found that our clients are interested in quarter of day gran

Be diligent in describing how the time you have spent has resulted in a benefit for your client. I found that our clients are interested in quarter of day granularity. E.g Thursday 2nd Feb 2012, 4 hours, Installing and configuring Operations' Team new Wiki website. Thursday 2nd Feb 2012, 3.5 hours, Fixed problem where the CEO's iPhone wouldn't sign in to the reporting website. To see what works for you, send your client your best effort on a time sheet for the first two days or so, and get their feedback. Its better than waiting an entire month to find out your reporting process isn't up to scratch.