I can for practice. I’ve never timed myself in field situations like you suggested.Right on man. Can you answer those other questions?
The most common thing I practice is pack on with rifle strapped to it (SG Quick Release) standing to prone. In general, it takes me about 55 seconds to “shot ready” (assuming I already ranged distance).
Occasionally something slows me down, like maybe I have a scope cover on that gets hung up on removal. Or my pack is stuffed weird and I can’t get a super comfortable base. Or I’ve goofed by leaving my magnification up, and have to back it down to locate the target first. But my goal is <1 minute (which sounds about twice as long as you).
I don’t shoot off a tripod, so I can’t say for that.