[klausa]

As one of the upthread comments mentioned, this is something that probably varies with sensitivity between people.

But I am quite confident I'd be able to tell 60/120hz with a 100% accuracy within 5s of being able to interact with the device.

Probably under a second on an iPhone, ~2s on a Mac with a built-in display and slightly longer on iPads and bigger displays. Add ~2 extra second if I'm using a mouse instead of a trackpad.

It is _that_ noticeable to me.