Formulae wouldn't work because you need the cell to change itself, which Excel can't do (formulae have to refer to other cells and post the result where the formula is).
Attached is in Sheet code, and runs every time you change any of the cells in C9 to J10 (in green). To extend it just change the SHIFTS range to whatever cells you want to include.
Enter any of the "TIme" numbers from Col A of the Data CGE sheet into any Green cell, and it will convert to the matching times automatically,
Clear the cell and the Macro stops.
Ochimus
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