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I would say not long really, I mean enough of course for the information to be absorbed & that's it. if someone is lost or really intent on nav at that moment then they could always just switch to nav display, but if something else is being displayed anyway, then the nav is secondary background really, & to have it dominate & just take over under those conditions isn't the most graceful. alpines nav will pop up the display, speak it's piece, & then return to whatever was primary in a matter of a few seconds.... that would be really nice & clean & better integrated feel.
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