Stepping stones timings on the podcast not right

[Saybul]

I’ve been using the above as I’m a couch to 5k graduate . Both the podcast with and without intro timings are out? I complete the podcast which says it lasts for 40mins in total10 mins walk warm up/ down plus 30 mins running. When I look at my watch it’s actually lasting 30mins in total. So I played the podcast at home checking the fine and sure enough it took 30mins to play but the running time on the podcast said it had taken 40mins so I think I’m only actually running for 20 mins in total? Is there a problem with the podcast? Thanks Linda