According to the IDBDR map, the IDBDR is broken into eight sections:
Section 1: 174 miles
Section 2: 200 miles
Section 3: 205 miles
Section 4: 125 miles
Section 5: 190 miles
Section 6: 127 miles
Section 7: 106 miles
Section 8: 110 miles
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Those distances might not seem like much, but depending on road conditions, they might take a while. That's one of the reasons we'll be getting an early start every morning. I'd like us to try'n stay on schedule, and I'd rather not be driving at night in the woods trying to find a campsite. Ideally, we reach our daily endpoint at a decent time so we can chill a bit in the evening - have plenty of time to set-up camp and make dinner... maybe have a campfire to sit around afterwards.
I also don't plan on us driving fast - road conditions will usually dictate how fast we can safely drive without beating up our vehicles and trailers. I'd rather err on the side of caution when it comes to speed. I want us to enjoy the ride, have time to stop and smell the roses and take pictures, etc. We're not going to race through the IDBDR just to "check the box".
And as mentioned before, flexibility is key. When we did the WABDR we had large sections of snow and mud that (while fun) slowed the group down, I've been blocked by downed trees (I'll have a chainsaw), I've gone down roads that further down the road were closed so we had to turn around and reroute, and in OR I was chased by forest fires that caused major reroutes and eventually forced me to end the trip early (and actually the threat of forest fires in ID and OR are my main concerns on this trip). So once we start on the 28th, the adventure begins!