How high would you have to count before you would use the letter A in the English language spelling of a whole number

Why this works

This riddle plays with the spelling of numbers in English. When counting, the first time you encounter the letter "A" is in the word "one thousand." Before that, numbers like one, two, three, and even nine hundred ninety-nine do not contain the letter "A." The clever twist is that while we might think of counting as a straightforward numerical process, the riddle emphasizes the spelling of those numbers, leading to the surprising answer of one thousand!