When is sunset in your area? Up here, your 8:30 pm time limit would get you in before dark.
However, if I were you, I'd bring a red rear blinkie light or two, even if you figure you'll be in well before sunset. They come in handy if it is heavily overcast or foggy, and also during twilight, to help you be more visible. If you think you might be cutting it close, you might also consider an item or two of reflective gear, like leg bands or something.
All the best!!
