The status of 20-week sub-3 in a row is below table. In this 20 weeks, I achieved 26 sub-3s. And I ran 41 Full-Marathons and 2 Ultra-Marathons.

Today, I ran the Itabashi City Marathon in Tokyo, and my time was 2:56:06. It's very flat course. The participant number for Full Marathon was 15,000. The total participant number was ~20,000.
As I achieved sub-3 today, I achieved consective 20-week sub-3s, and achieved 26th sub-3 in these 20 weeks.

Below pictures are sights of the event.

Today I ran full-marathon in Challenge 2020 1162nd day. My time was 2:58:35. Pictures and articles are posted by organizer in below link.

https://www.facebook.com/c2020marathon/posts/1991465841171464
(In Japanese only. Sorry...)

As I achieved sub-3 today, I achieved 19 weekly sub-3 in a row as I mentioned previously.
And this was my 280th Full Marathon.

Today, I ran the 14th UP RUN Inage Kaihin Park Marathon in Chiba Pref., and my time was 2:58:41. It's very flat course, but the wind was very strong today because the park is on the sea side. The participant number for Full Marathon was 27. The total participant number was ~300.
As I achieved sub-3 today, I achieved consective 2-day sub-3s, and achieved 24th sub-3 in these 18 weeks.

Below pictures are sights of the event, participation award, and 1st place award.

Today, I ran the 3rd Sportsmaterun's Katsushika-ku Awakara Kasenjiki Horikiri-bashi Marathon in Tokyo, and my time was 2:55:57. It's very flat course, but the wind was strong when I ran toward upwind because of river bed. The participant number for Full Marathon was 37. The total participant number was ~300.
As I achieved sub-3 today, I achieved 18 weekly sub-3 in a row, and this is 23rd sub-3 in these 18 weeks.

Below pictures are sights of the event, participation award, and 1st place award.

I hear that the world record of weekly sub-3 in a row is 28 weeks achieved by Mr. K. C. in Tokyo, Japan. Do you know anybody else achieved longer weekly sub-3 in a row?

The status of consecutive 17-week sub-3 is below table. in this 17 weeks, I achieved 22 sub-3s. And I ran 37 Full-Marathons and 2 Ultra-Marathons.