Increasingly common on business bullshit bingo cards the English-speaking world over, 'close of play' is the latest way to say '5.30', presumably employed by people a) to make the working day seem more fun, by describing it as 'play' b) because they are cunts.
Presumably, like the equally execrable 'touch base', the expression originated in a shit American sport.
So where are we gonna be by close of play?
We're not playing. I'm working. You're talking like a prick.
Ok, I need to touch base with the client before close of play.