If a Nexus 6 is your daily driver, it couldn’t hurt to start looking for a new phone.
Google guarantees you’ll get Android software updates for at least two years from whenever the device became available in the Google Store. The Nexus 6 was released in November 2014. Security patches are promised for three years from availability or 18 months from when Google last sold the device.
The impact on you: Even though the Nexus 6’s end is nigh, the phone may not need to head straight to the recycling bin. Google often updates devices beyond the end date as evidenced by my 2013 Nexus 7, which still gets monthly security updates and is running the latest build of Marshmallow. It could run out of luck with Android N, but there’s some precedent for a longer lease on life if you just can’t part yet with your Nexus 6.