A cool little tidbit I discovered in my favorite GTD application, OmniFocus, is that you can put a space-seperated list of times into the time estimate field for projects or tasks, and OmniFocus will add them up. Simply type in a time in the typical OmniFocus format (1m, 1h, etc.), type a space, and then enter another time. When you press enter or click outside of the time estimate box, OmniFocus will combine the times and give out the total.
For example, if I enter “10m 9m 2h 4m 6h” in the time estimate box, OmniFocus will convert it to 8h 23m.
