Need help skipping blanks from formula computation

I derived the following equation to calculate the hours a household employee is here working =(((60−min of hour arrived)+minute of hour leaving)÷60)+(hour leaving−Hour arriving) where all the text are actually cells, so the real formula looks like this =(((60−C3)+E3)÷60)+(D3−B3). It works great when the employee was here and there are values; on days off the "60"s present in the formula to convert minutes to percentages of an hour make the equation yield a value of 1. I would like to tell the formula to ignore itself if there are no values in B3-E3, but can't figure out how based on an hour or so of perusing chat rooms. Can anyone provide a solution? I'm sure it's some variation of a COUNTIF(B3:E3<>""; or something like it! Thanks...

Hi marv,
I wonder if I am missing something. If I have a time date value in B2 of 8:10 and a time date value in C2 0f 9:30
then =C2-B2 gives me a duration of 1hr20m. Isn't this what you are looking for?
If one cell has an entry and another doesn't that will produce an error so wrap it with IFERROR()
=IFERROR(C2-B2,"") this will leave the cell empty if there are not date values in both C and B.
Will this work for you? It simplifies your input to 2 cells. A potential for error is if you enter your values on different days. i.e. employee arrives at 9:30am and is logged in, leaves at 4:30pm but the entry is made after midnight. Numbers will add todays date to a time if it is not specified so it would think your employee has worked 7h plus 24 h.
When I run your formula with inputs of 8,30,9,30 I get 2. That can't be right.
quinn

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