When you change someone's time off balance manually, either by increasing it or decreasing it, this can only be done in days.

If you wish to make a change that is less than a day, you must enter it as a decimal.

You work this out based on the employee's working hours per day for their time off policy.

You can then see the working hours per day at the top.
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The calculation you need is the following

If an employee's default working day is 7 hours, this means 7 hours equals 1 day. Half a day would be 0.5

If you want to increase their time off balance by 3 hours, you would divide 1 by 7, then multiply it by 3.

(1 ÷ 7) x 3 = 0.428571

The amount of decimal places you enter is affected by what you have set in Settings > General > Number of digits shown after comma.

If set to 4, instead of entering 0.428571 when changing the balance, you would enter 0.4286.

Below is an example of what 7 hours as decimals would look like in a calculation. You would then need to round up relevant to your number of digits settings.