It's a lot less than a second, partly because you get used to how long it takes so you turn slightly before you finish reading so it's only the redraw time that matters not the whole time between press and new page.
There's always going to be disruption, even if it's only having to move your eyes from the bottom to the top of the screen so it's a case of what is tolerable rather than disruption or no disruption.
I have no problem with eInk refresh times on my Aura HD.
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