Hi, Diane-
You may find it useful to reconsider how employees accumulate time
off, and how they spend it. Companies I've worked for express vacation
in terms of hours- if you get 10 vacation days per year, that's 10
days times 8 hours per day = 80 vacation hours. If you express
everything in a single time unit you will avoid converting back and
forth, as well as testy little arguments about what constitutes a
"day", for instance. (You could also easily divide by 8 to convert
hours to work days.)

Is that a possibility?

Dave O