There was 5 hours in question,
Let's assume he killed her at 3a, then he panicks for an hour. He calms himself down and starts thinking of what to do with the body, he checks the maps on his phone, makes a plan, cleans up and wraps the body; another hour passes.
We're at 5a. He drives for an hour to a location that he's familiar with, driving the speed limit the entire way to avoid being stopped by a local patrol officer with the dead body of a 3 year old girl.
After a few wrong turns, he pulls up to the dump site at 6a. He buries and/or conceals the body, then cleans up any visible evidence; he leaves the site at 6:30a.
He drives the speed limit once again to avoid a ticket on his way back from the dump site. He gets back home at 7:30, pulls up, parks the car. He does a last once over to make sure he didn't miss anything.
The time is now 7:45a. His wife is sleeping in, it's her day off (just a guess). He goes into her bedroom and wakes her up in a (fake) panick, "Honey, Sherin is gone and I can't find her. She was just outside now she's gone!"
After some shock and initial panick, his wife says, "call the police!" He then places a 911 call at 8:15a.
Remember, this timeline ASSUMES a lot; including the wife/mom isn't involved. Change in ANY of the variables would throw everything off. But, it's a start.
An hour, at 60 mph (average Hwy speed) would place a radius of 60 miles from his house, cross referenced with his commute to work would be a great place to start looking for a body.
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