If it's been 19 times since the year started including the one in the backstory as the 19th,and year's started 6 days ago then the last time couldn't have been a Tuesday unless on Wednesday at 12 Am geto and gojo had kfc 18 times,and considered 12Am Tuesday night.
I just love how every single time Fushiguro is ever inconvenienced with anything he immediately hits the good ol' Mahoraga panic button! Sorry little bro, you are never dodging the allegations.
The way he said this is the 19th time and the year just started 6 days ago meaning that there's a possibility of only one Tuesday since the start of the year. The math isn't mathing 😭