No official timeline has been released, but people can kind of deduce what the general time frame is, from when he spotted the girls (my theory) through to when he left the woods. One major consideration are the distances involved, this killer went through an awful lot of trouble to carry out the murders. Yet it still fits within a tight time frame.
MOO on this:
1:37-1:40 PM, he spots them being dropped off or sees them shortly thereafter. A witness states they saw BG on the main trail, just west of where the girls were dropped off. I'm picturing BG loitering/lurking right in that area. This is roughly where the Gerard Trail and the main trail meet. I think he was some short distance west of that trail head for the simple fact that he would have been obscured from both C.R. 300 and the tiny parking area which was off of C.R. 300, where the girls were dropped off.
1:40 PM and for some time thereafter, he loiters, watching the girls disappear down the trail, around the bend in the trail which leads to a straight section between the bend and the northwest (NW) approach to the bridge. He figures they're alone, they're juveniles so they don't have a vehicle with them, and he thinks about and fantasizes about any number of other things which will enable him to carry out his fantasy, and what the aftermath might be like.
He combines this thought process with his preparation for the murders, which could include any number of things. We don't know if he changed his appearance some at this point, loaded up on whatever ended up under the outer jacket, etc., but I imagine the guy had to do some prep right before he set the wheels in motion to carry out his fantasy.
At some point or perhaps through this entire time up to the point where he steps on the bridge, he's monitoring what the girls are up to.
2:07 PM Libby uploads the image of Abby to SnapChat. Now what time it was taken is anyone's guess, but my hunch is that by 2:15 or so they were most of the way across the bridge. I'm of the opinion the abduction happened around 2:20 PM.
2:40 they were probably deceased or dying, as he was preparing to leave the area.
So in roughly one hour, much of it taken up by some preparation on his part, waiting for the girls to cross the bridge, walking the trail, walking the bridge, etc., he stalked and then murdered the girls, and prepared for his exit from the CS and the woods, maybe doing who-knows-what at the CS.
Very tight time frame, in my opinion. From abduction to time-of-death could be 20 minutes or thereabouts.
JMO
