This was my OAHS, not the peak but some of the better ones on camera.
I practised a lot and my record was 18 seconds straddled on my right arm, although I never caught this on camera, (the longest was around 10 on camera) it felt like a lucky one.
Ater all that training though I had to stop due to blood pressure headaches. I trained foolishly, going again and again with little rest. Let this be a warning to ye handbalancers, take your time, and breath.
Also the importance of having flexible shoulders. Mine were and still are very tight, causing my back to arch a lot, I did not realise at the time but this is one of the key reasons.
Alas, I cannot and do not train it anymore due to the headaches, but here was some of my attempts.
RIP OAHS