Among people who have a running streak, your comma day is when you have run everyday for 1,000 days. For me, that was today.
My current streak (there have been other, shorter, steaks before) started on 31 December 2018. During the last 1000 days I have run every day, always 2 kilometres or more. My total distance over the 1000 days is 9,692km (6,022 miles), that is an average of 9.7km a day (or 6 miles a day). The longest single run was 108 miles in Junes of this year (but that took 38 hours, so it was two days’ worth of running).