Definition of all of in US English:

all of

phrase

  • As much as (typically used ironically of a quantity considered small by the speaker)

    ‘the show lasted all of six weeks’
    • ‘This moment of Zen lasted all of 30 seconds.’
    • ‘That mood, however, lasted all of five minutes.’
    • ‘This generated an amazing meeting that lasted all of thirty seconds, in which Brian declared ‘we’re keeping Studio X’.’
    • ‘Criminally this lasts all of about ninety seconds as if he wasn't supposed to be in the film at all but just happened to busking there when the director wandered by with his camera.’
    • ‘That final plan lasted all of about six months.’