So far I ran 265 Full Marathons and 26 Ultra Marathons based on my rules I posted. Below table is Full Marathon list from 201st to 250th I ran.

In this period, I achieved sub-3s for each months from January to December.

On the Challenge 2020, it is marathon challenge event for 2020 consecutive days from Jan'2015 to July'2020 just before Tokyo Olympic. Somebody or a team runs full marathon each days. Below sites are the event information (in Japanese only).
     https://c2020.jimdo.com/
     https://www.facebook.com/c2020marathon

I will upload 251st- and Ultra-Marathons later.