I disagree. Another poster tested the drive and came up with following timeline:
JY left the HI at midnight, drove 2 hrs. and 40 min. to Raleigh, murdered his wife and unborn son, cleaned up, staged the scene, drugged his daughter, drove back to the HI arriving around 6:30 am, tilted the surveillance camera up at 6:35 am, went to his room, dressed for his meeting, retrieved the hotel receipt and his luggage, and left the hotel around 7:00 am.
This timeline allows JY 1 hour and 10 minutes to commit the murder, clean up, stage the scene, and drug CY. I personally believe that JY did not intend to be at the house for that length of time. The fact that he propped the exit door open at the HI supports this. The exit doors were locked until 6:00 am, and he needed a way to get back in without using his keycard and without being seen on camera. He intended to strangle Michelle but resorted to beating her to death when strangulation was not as easy and quick as he anticipated, and once he attempted to kill her, he could not back out; he had to kill her at this point. The autopsy supports this. I believe, in all likelihood, he thought he could be in and out of the house within 20-25 minutes. Because of the bloody scene, he had to clean himself and CY; therefore, he ran about 30 minutes later than he planned. This explains him arriving at the HI after the exit doors were unlocked and him showing up a half hour late for his meeting. It also explains his impatient behavior towards the clerk at the convenience store in King, NC when he stopped for gas a little before 5:30 am.
JY leaving the HI on Friday morning at 7:00 is within the time frame. It works, and it works very well indeed.