Some games have a half-time result market (eg: Arsenal v Man Utd tomorrow (Jan 30th). It should be possible to see if the market has been closed, but I don't know how soon the market closes after the end of the first half. Also I expect most games do not have this market. There may be other markets based on the first half. https://www.betfair.com/exchange/plu...et/1.178252700
Other than that, I have no idea. I make the assumption that the first half will have finished 52-60 minutes after the first half started, but it's not guaranteed.
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