One fan told Today she had been in line for 12 hours but had “absolutely not” peaked yet.
Styles is set to play two shows at Accor Stadium, tonight and tomorrow.
After that, he’ll jet off to Auckland for the final leg of his Australia-New Zealand tour.
It began in Perth, where, encouraged by the audience, he indulged in the bizarrely prevalent new custom of the “shoey” onstage.
Whether he does another in Sydney is a question that remains unanswered.
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But for the fans lining up – with the whole day still to wait through before Styles comes on stage – it’s a moot point.
“I love everything about Harry Styles. I liked him since I was seven, a really long time,” one die-hard said.
“I’m really excited to see him.”
Another said she had spent $865 on Styles merchandise already.
The show gates open late this afternoon.