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If you have a cell with the start date/time then it's fairly straightforward. Excel can perform mathematical operations on dates & times.I think all you need to do is format the result cell as numeric and enter the following formula:=(NOW()-xx)/60.It could be NOW() or TIME(), I'm not sure.xx = the address of the cell containing the start date/time. The result will be in seconds so dividing by 60 converts it to minutes.Then again, I could be totally wrong. It's a long time since I've used Excel. Click on help and check out the date/time functions.