to hear that 10% - of fairly general populations which aren't selected for Singulitarian or even transhumanist views - would endorse a takeoff as fast as 'within 2 years' is pretty surprising to me.

I wouldn't be surprised if an AI went from human-level to significantly-smarter-than-human just by brute force of 'now that we've figured out what to do, let's do it HARDER', and this sort of improvement could be done in under 2 years. This is quite a different thing from a hard takeoff.