Maybe 45 mins bit you can stop half way and go for a hike around the lake to see the bears and wolves ,so you could be there for hours depending on your level of interest .
It can depend on who is in front of you. The road is mostly a single lane. I think we normally take about an hour to drive through. This doesn't count the stop in the middle to park amd hike.
30-45 minutes unless you stop to get out and see the attractions not seen on the drive (eagles, petting zoo,owls,bears and wolves).
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