Maybe not late, but last time in 2019, late September, islands stayed open until 9pm, when the studios closed at 5pm. There was a bit of an increase into islands, as those of us wanting to leave the Studios at close, have more park time. Train is very crowded to leave the Studios, by 4 pm. I tend to just stroll out the front and walk to islands, rather than stand in a 45 minute line, even with express, to board train.