We just cross-referenced this with the official BBC Witness page on the BBC World Service website, and it seems that the episodes there are also 10/11 minutes long each.
If you think they should be 60 minutes long, we suggest you reach out to the relevant contact at the BBC, since they are the ones who manage the podcasts - we merely provide a platform for streaming them.
Hope that helps! Let us know if you have any other questions.
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"It's my job to see the world and report back. It's my job to feel things fiercely. And it's my job to be present." - Maggie Rogers