It's just gone 4:15pm here. We switched over to British Summer Time (+1 hour) at the end of March.
I think there'll be about another 4 hours of activity left today. I know on Friday when I checked, she'd gone to sleep by 8pm. It might be different now the chicks are hatched though. The sun will set here at about 8:45pm tonight so the parents could be grub-hunting til then.