See minutes online for a more detailed record of the discussions.
The group welcomed Wendy Reid (Rakuten/Kobo) as the third co-chair of the Working Group
There are schema.org terms for this (duration) that can be reused. The only issue is that the value of that term is expressed in ISO 8601, which is not very user friendly. However, this format is used at various places already (HTML, XSD datatypes, etc) so it was accepted as a format instead of coming up with something new.
There are a number of formats out there, and the question was whether WPUB should be prescriptive in this area. The overall consensus is that we should be as permissive as possible, and follow the lead of other standards in this respect (e.g., for the audio element in HTML)
The question was whether it creates any problem if (1) audio elements are listed in the WP’s reading order and (2) if these audio elements are mixed with other illustrative resources like diagrams in PNG or PDF. The overall consenus was that this should not create a problem.
A F2F agenda is now online and will be finalized soon.