Assuming your shift duration is in A2, calculated time is given by following
formula:
=IF(A2<"6:0",A2,IF(A2<"8:0",A2-"0:30",A2-"1;0"))

Cheers
--
AP

"bamboozled" a écrit dans le message
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What formula would I use to calculate breaks automaticaly, for example on
an
eight hour shift a one hour break should be deducted, in a six to eight
hour
shift half an hour should be deducted. Anything less than six hours and no
break is deducted. I have set up a spread sheet to work out the hours
worked
but I need to take break off this, I would rather the spreadsheet
calculate
this for me, than me have to input the breaks manually.