3mins how we do it at the worlds or abroad works ok... you can still eek it out as it's when you address the targets, and so it's grey as to what that means.
I think that's the problem, having a definitive list of things that starts the clock. Abroad it tends to be bum hitting seat... but then you can stand and pull or lay your gear out etc etc...
I'm not sure there's a problem... but then i will make full use of the 50 minutes of shooting time my £10'er bought
... and a bit more beforehand