What is 1t in this context? I'd expect this to be 1 week based on its position.

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https://media.kbin.social/media/c3/30/c330296198188efecd966d01f69a43414ea41fa58dfa5916df00481249abe989.jpg

Ernest is from Poland. In Polish, the word for week is “tydzień,” which starts with the letter “t.”