The incorrect time on your phone? That is a well know issue on the internet.
Or the calculated driving time by NextGen?
On what route? Compared to? Is the route set logically or set different from the one you have in mind?
Routing is always approximately. Traffic circumstances permitting, Primo/NextGen is IMHO quite accurate. Not to the minute, but the differences between estimated time of arrival and expected time always were limited for me (and I use them for many years) and a consequence of in reality driven speed. (primo never calculates time lost at red lights, for primo it's always green light )
Are your parameters set up properly? Like driving a car while calculation is made for truck or your normal speed is set at bicycle speeds :D
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