You didn't indicate how much or how little detail you want. Here's a start:
1. View | Resource Usage. RightMouseButton on the right side of the
display and set the popup menu so that there is only a tick against Work.
2. RightMouseButton on the timescale at the top of the display, click on
TimeScale and set the display to show months (I did it by setting both the
middle and bottom tier Units to Months and the middle and bottom tier Count
to 1.
3. Project | Group By ... and choose Work vs. Material.
4. The figures on the line labelled "Type:Work" are the numbers you want.
You said you wanted days or man-months ... you'll have to some simple math
to go from hours to days (divide by 8).
JLB, PMP