Timer that starts counting up in mins soon as a cell is filled

I want a time tracker that will count time soon as a specific cell is filled.
Example:
a column has a drop down list of items, b column start counting minutes soon as the item is chosen from the dropdown list. soon as column c is filled the counter stops.

Have a try with these macros.

To be pasted in a standard module:

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To be pasted in the Sheet1's module:

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