Most decimal digits memorized in one hour
Who
Ryu Song I
What
4,620 total number
Where
China Mainland (Wuhan)
When

The most decimal digits memorized in one hours is 4,620, and was achieved by Ryu Song I (North Korea), at the 2019 World Memory Championships in Wuhan City, Hubei, China from 4 to 8 December 2019.