The car could manage more than ~120 miles between stops, but for us that's about the ideal spacing for breaks. That spacing also allowed us to keep a buffer of ~20% (LeafSpy) in case the next charger was broken or in use, and stop charging around 80% before charging tapered too badly. Our average consumption was 3.7 miles/kWh in both directions, while we averaged 3.8 miles/kWh on this trip with the 40kWh Leaf, and 3.9 miles/kWh with the 30kWh Leaf.
On the trip down we ate an early lunch in Castle Rock, ate an early dinner in Cottage Grove (which is why we were there so long), and stopped for a coffee in Grants Pass. We ate lunch and dinner at the restaurants, so we could have made a shorter stop if we had a gas car and ate while we drove, but we'd rather take the break. Also, while we had very little traffic, we still probably lost ~10 minutes in Seattle and ~20 in Portland, so it would really have taken a gas car ~8 hours. I'd say we usually would average a half hour break after every 2 hours of driving, so stopping for charging didn't add much to the length of our trip, though it did limit our options for where we ate lunch and dinner.
Also, we mostly stuck to the posted speed limit, so we might have driven ~10% faster in a gas car and saved 45 minutes. So, the main impact of taking the Leaf on this trip was fewer choices of where to take a break and get meals, sitting down for meals instead of eating in the car, and not driving over the speed limit.