Updated. Thank you to everyone who helped! I probably won't get around to adding in the source reference links until Monday. If anyone needs the source for any info in this timeline before then, please feel free to holler at me.
Hailey Dunn Timeline
Sun, Dec 26
Unknown: Hailey returns home from an overnight Christmas visit with her dad.
09:00:00 PM: Hailey's brother sees Hailey playing a video game in the living room as he leaves the house. Last reliable sign of life from Hailey.
10:00:00 PM: Billie claims to have seen Hailey watching TV in her room.
Mon, Dec 27
Unknown: Billie claims to have looked in on Hailey in bed in her room. Is unsure if she's really there.
05:30:00 AM: Shawn leaves for work. 24.9 miles/36 minutes Colorado City <> Snyder. 5:30am + 36 min = 6:06am
06:00:00 AM: Shawn arrives at work, gets a Dr. Pepper, sees supervisor, does not speak to anyone.
06:06:00 AM: Estimated arrival time at work for Shawn. 5:30am + 36 min = 6:06am
06:10:00 AM: Shawn leaves work. 24.9 miles/36 minutes Colorado City <> Snyder. 6:10am + 36 min = 6:46am.
06:20:00 AM: Billie leaves for work, picked up by co-worker. Billie leaves cell phone home for the kids to use.
06:35:00 AM: Per cell phone pings, Shawn returns to Colorado City, where Hailey's home is located.
06:46:00 AM: Estimated arrival time at Colorado City for Shawn from 6:10am. 6:10am + 36 min = 6:46am.
06:56:00 AM: Shawn's cell phone stops pinging in Colorado City. 38 miles/41 minutes between Colorado City <> Big Spring. 6:56am + 41 min = 7:37am
07:37:00 AM: Estimated arrival time at Big Spring for Shawn from 6:56am. 6:56am + 41 min = 7:37am
09:38:00 AM: Per cell phone pings, Shawn arrives in Big Spring, where his mother's home is. Shawn makes 11 phone calls.
12:00:00 PM: Billie claims a man (Charles) who lives with a neighbor (Travis) sees Hailey in yard talking on phone. Mike Board of WOAI claims his station found a woman who saw Hailey in the yard on the phone, but no time is given.
02:40:00 PM: Per cell phone pings, Shawn exits Big Spring. 38 miles/41 minutes between Colorado City <> Big Spring. 2:40pm + 41 min = 3:21pm
03:00:00 PM: Shawn claims to arrive at Hailey's home in Colorado City. Shawn claims Hailey is there, and tells him she is going to her dad's, then to her friend's.
03:15:00 PM: Shawn claims Hailey leaves home, leaving all personal belongings behind. No one sees her walk anywhere on this entire day. Bloodhounds later track Hailey going toward her father's house, toward her friend's house, and toward a hotel.
03:21:00 PM: Estimated arrival time at Colorado City for Shawn. 2:40pm + 41 min = 3:21pm
04:00:00 PM: Brother returns home. Pounds on door for 5 minutes. No one answers. Enters home through a window. Shawn is standing in a hallway with "a deer in the headlights look."
05:09:00 PM: Estimated time Shawn leaves Colorado City in order to pick up Billie at work at 5:45pm. 24.9 miles/36 minutes Colorado City <> Snyder. 5:45pm - 36 min = 5:09pm
05:45:00 PM: Shawn picks up Billie at work.
06:20:00 PM: Billie and Shawn make 2 ATM withdrawals in Snyder, $60 and $80. Billie later voluntarily tells LE that the money was buy illegal narcotics from someone in Scurry County for her and Shawn to use. Later still, Billie claims on national TV to have gotten the money to use for groceries and gas, and that she and Shawn were in Scurry County for only about 15 minutes. 24.9 miles/36 minutes Colorado City <> Snyder. 6:20pm + 15 min = 6:35pm + 36 min = 7:11pm. Note that drive time from Billie's workplace to her mother can not be included in the timeline at this time, as there is no acceptable source currently to confirm where Billie works, or where her mother lives.
07:11:00 PM: Estimated arrival time at Colorado City for Shawn and Billie. 6:20pm + 15 min = 6:35pm + 36 min = 7:11pm
07:30:00 PM: Billie and Shawn claim to arrive back home in Colorado City.
07:30:00 PM: Billie and Shawn begin watching movies.
10:00:00 PM: Billie and Shawn go to bed. See 10pm Sun Dec 26 for last time Billie made any effort to determine Hailey's whereabouts or well-being.
Tue, Dec 28
12:00:00 PM: Billie calls Hailey's brother and tells him to text Hailey's friend, and tell her to tell Hailey to come home. Brother texts but unable to contact friend. Brother calls and friend says Hailey never said she was going there, and never came over. This is the first time since Sun Dec 26 at 10pm that Billie has made any effort to determine Hailey's whereabouts or well-being. Billie has a co-worker drive her to Colorado City. She checks several places for Hailey.
02:00:00 PM: Billie reports Hailey missing to LE at the police department.
Note: 24.9 miles/36 minutes Colorado City <> Snyder. 2:00pm - 36 min = 1:24pm. Billie spent somewhere between 24 minutes and an hour and 24 minutes checking places for Hailey before going to LE to report her missing.