Formulas Involving Times In HH:MM Format - Why Is 2 Hours Not 2 Hours

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Some rounding will be required. Google 'floating point errors' to read all about this.

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This is almost certainly floating point rounding errors.

See: https://en.m.wikipedia.org/wiki/Nume...icrosoft_Excel

Use ROUND to help mitigate the issue.

If you calculate with times in Excel, rounding differences can occur.
A well-known example is when you take the time off a date with mod 1.

These rounding differences can be overcome by using the HOUR, MINUTE and SECOND or ROUND functions.
Exactly how this is done depends on the situation.

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Glad to have helped.

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