I reckon the venues actively discourage artists sharing stage times. They want you in as early as possible spending money on overpriced food and drinks.
It's always worth checking the artist on https://setlist.fm as people often put the start and end times on for past gigs - not infallible but decent for making an educated guess.
There are reasons they want you in earlier. The venue wants your ale money and the act, if they’re a nice bunch, would probably like you to see the support(s)
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The second song was just finishing.