It seems that three different time formats are used for item running time:
hh:mm:ss
[hh:]mm:ss
ssss
The second format is like the first, but with hour field elided if zero.
Please convert all running times to the second format for display.
Thanks.
That's actually provided by the publisher so you're probably seeing one of those formats across an entire publisher. I'd try to parse it up but the spec doesn't cover what's in that field so it would be pretty hard to get that right.
Thanks for the feedback.