Last year Gina, Herb & Alyce, Hillcrest and I did it with 2:01 RIDE TIME.

We do start before it gets dark so some of the climbing doesn't require lights. As you get about the 4 mile point, the eyes allow you to ride without a headlight and if you crash into something at 6 mph, maybe you shouldn't be on a bike.

We do use the lights climbing though when it gets dark, especially a rear red light for traffic approaching from behind. But it is easy to hear and see cars ( if any) coming from far.

2 hours ride time and time to break on the climb and socialize, I say 3 hours.

If we do Saturday night, we could start when it's dark, but would be finished late.