I managed the first couple of runs for W5 reasonably well, but couldn't quite get round this part first try. I managed 15 minutes but then my legs gave out, shortly followed by the batteries in my headphones, so at least I haven't had "the conversation" with Sanjeev telling me how well I've done whilst I was slinking back home
Still, 15 minutes is the longest I've run continuously, so that's good. And I'll have another crack at it tomorrow or Sunday.