The stat for "time open" under Vital Stats isn't clear as to what time range it is describing. Below it is a "this month" section which also has a "time open". So is the Vital Stats "time open" for this year, or for all time, or something else? Maybe "all-time time open" or "time running since install"?
With the v4 updates "time open" is now in the "this month" section and should be clear.