I date vs duration complications I cannot figure out. I assume it is from the contractors's calendar. I am going to import others to see. But also, will all time be calculated correctly if I put the hours per time period at 8dy 40 wk 172 mo, 2000 a year. It is odd p6 makes you do this because each month is a different amoun 30/31 dys month etc. Is there a source as to a good basic setting for 5 dy wk , 6dy wk, 7dy wk.