PBS question for anyone.
On the PBS desktop application, when you look at the calendar view you can look at each trip and it has "C/I: hh:mm" at the start of the trip (where hh:mm is some time like 16:32), and "C/O: hh:mm" at the end.

I know it's probably supposed to indicate how much time for some limit (30 in 7?) is flowing INTO the trip (carry in? C/I?) and how much has to be looked at after the trip (carry out C/O?), but for the life of me I can't find any combination of trip length, total block for the trip, or anything, that makes those C/I and C/O numbers have any meaning.

Anyone know what those nums are?
Thx!