I am having a problem with adding a column of time values and need an experts help!

Column b has the time in and is formated as Time 13:00.

Column c has the time out and is formated as Time 13:00.

Column d adds the total time which has a formula of -

=if(c10>b10,c10-b10,1-(b10-c10))

Then I have Column d adding up to give me a total of time. It is formated as Number. The formula is g=sum(g8:g26)*24

This all works great as long as there is actual time entered. However when the cells in e & f as blank it still enters a total as it is taking it as 0:00 which it is counting it as 24:00 and adding this to the total. The formulas in b & c need to stay as is as this is the only way it will calculate ok if the b column is greater and the c column (ex: 18:00 as b and 6:00 as c)

Can anyone tell me how to get around this problem? I would like to display the total as 0 if there are no times entered or blank. My spread sheet has 20 rows in which I can enter information if needed otherwise they sit blank....

Thanks

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