Not sure what you're doing exactly, but you can check out how I record
time spent on projects here...

https://app.box.com/s/23yqum8auvzx17h04u4f

...where each session has a 'start' and 'stop' time on a separate row.
The sheet also includes cumulative time totals for month,project and
lets you specify an hourly rate for billing followed by cumulative
amount totals for the month,project.

--
Garry

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