
The Pacific Union College student described Bryan Hartnett and Cecelia Shepard passing them shortly after 5:15pm, so I am going to attribute 10 minutes to this description of "shortly after" (you can adjust all future times by less or more depending how you interpret "shortly"). This would have our victims being spotted about 5:25pm. If we then add one minute for Bryan Hartnett and Cecelia Shepard to reach their destination, and about 9 minutes for them to gather their belongings and reach the shores of Lake Berryessa, we have them lying down on their blanket at approximately 5:35pm.
A REVISED TIMELINE AT LAKE BERRYESSA