Separate traffic info in AppleMaps from the Notification Center... they're related - but then again, not...
Using the Frequent Locations feature - data is accumulated and once patters in your activity can be discerned - if the feature sees you as being somewhere other than where you've been by habit according to the feature... it will tell you how long it might take you to get to where it thinks you usually are at that given time... for example: on Saturday mornings, my phone will show in the NC how long it should take me to drive... or walk to my preferred place for coffee when it noticed I had a habit of Saturday morning coffees... Maps/Traffic on them is only related to the notification center in that if there's traffic data that might impede your usual habits - it might take that into account.