Assuming 0.04166667 is required, the following result was found.
1 person day = 26640 seconds and 1440 minutes = 24 hours. -- 0.07 person days = 30 minutes or 0.14 person days = 1 hour. 0.04166667 =(ROUND(B5/0.07, 0)*30)/1440 -- now format to [h]:mm:ss -- yields 1:00:00 0.04166667 =(ROUND(B5/0.07, 0)*0.5)/24 -- now...