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all of (something)
1. The entirety of something. Boy, cleaning the kitchen just zapped all of my energy—I need to lie down!
2. Just; only. Luckily, that phone call took all of five minutes, so I wasn't late to the meeting after all.
3. At least. Don't be fooled by his baby face—he's all of 30 years old.
1. The entire amount of something, as in The baby ate all of his cereal. This usage is relatively new, the word of being included only from about 1800 on.
2. No less than, at least, as in Although she looked much younger, she was all of seventy. [First half of 1800s]
all ofas much as (often used ironically of an amount considered very small by the speaker or writer).
1995 Bill Bryson Notes from a Small Island In 1992 , a development company…tore down five listed buildings, in a conservation area, was taken to court and fined all of £675.
Not more than: a conversation that took all of five minutes.