A big contrast when looking at the most popular reading times overall, where the daily morning commute and lunch hour see the biggest spikes. (goodereader.com)
It makes perfect sense that classics were popular reading at the time. (annerallen.com)
This claim is supported by SimilarWeb data: according to the charts, Amazon Kindle is only the 2nd or 3rd most popular reading app in Google Play. (publishdrive.com)