Sentence:  I was about to say that I had known the Celebrity from the time he wore kilts. But I see I will have to amend that, because he was not a celebrity then, nor, indeed, did he achieve fame until some <WSD>time</WSD> after I left New York for the West. 
Meaning of the word marked with <WSD> tags:  A measurement of a quantity of time; a numerical or general indication of a length of progression.