Turn a plain hours number (like 8.5) into a proper Excel time.
Copy this formula
=A2/24Excel stores time as a fraction of a day, so dividing hours by 24 produces a time value; format the cell as Time to display it. Divide minutes by 1440 and seconds by 86400 similarly.
=8.5/24→8:30 AM8.5 hours shown as a time.
Time back to hours
=A2*24Multiply a time by 24 to get decimal hours.
The cell isn't formatted as time. Apply a Time number format to the result.
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