[1] ( 版) http://feedpress.me/automagic

itunes:duration00:8:19</itunes:duration>

[2] RSS tags for Podcasts Connect - Podcasts Connect Help ( 版) https://help.apple.com/itc/podcasts_connect/#/itcb54353390

Specify one of the following formats for the itunes:duration tag value:

HH:MM:SS

H:MM:SS

MM:SS

M:SS

Where H = hours, M = minutes, and S = seconds.

If you specify a single number as a value (without colons), the iTunes Store displays the value as seconds. If you specify one colon, the iTunes Store displays the number to the left as minutes and the number to the right as seconds. If you specify more then two colons, the iTunes Store ignores the numbers farthest to the right.