I used:
Countdown: IIf(DateDiff("d",[Time of Findings],[Exam Ordered])>0,Format([Time of Findings]-[Exam Ordered],"d:hh:nn"),Format([Time of Findings]-[Exam Ordered],"hh:nn"))
It excludes DAYS all together. And if I add D(days) back into the equation I get 30 once again.