I don't 'practice' (that is, with no intention of immediate utility) putting seat belts on. On the occasions I do put them on, it takes some small number of sec

I don't 'practice' (that is, with no intention of immediate utility) putting seat belts on. On the occasions I do put them on, it takes some small number of seconds to put on, depending on how complicated the system is and how accessible the various parts are. Even if it took someone several minutes to strap on a backpack-like device, it would likely save lives in many scenarios. As to my appeal to the cost of paratroopers' parachutes, that was in direct response to a very specific claim in the post I responded it to: >It would be expensive to outfit all tall buildings with parachutes