Mr. Silver I rode 128 miles today and from start to finish it took us 10 hours(time on and off our bikes). We stopped at the 46, 59, 87 and 116. Most stops were long enough for everyone to grab a snack and use the bathroom before we hit the road with the exception of lunch but it too was quick.

Since this is planned for November and daylight is short I'm inclined to think you may find yourselves out on the road after the sun sets. I'm assuming you want all participants to have fun but I personally would feel very stressed if I was racing the clock to get in before dark.