Formula Checkbox and Duration

I"m trying to complete a formula checkbox field that will tell me if my duration is 1 day or less on a record.

Duration is a formula duration field that calculates the date a task is completed - the date it was received and excludes weekdays.
ToWeekdayN(ToDate([Date Initial Review Complete]))-ToWeekdayN(ToDate([Date Created]))
The value display of the field is set to Days

I'm trying to use a formula checkbox field to determine if the record was completed in 1 day or less.  It will calculate correctly using 0 days but does not check if the record was done in 1 day.

Can anyone advise of the right formula to use?

Thanks,   


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Sheila Allas
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