I can't remember having heard an exact time. There is only this:
snip~ What Chelsea does know is that the day Haleigh was reported missing, cousin Joe split for Tennessee; she was beyond exhaustion. “We’d just left Gainesville, dropping (Misty’s mother) Lisa off to be with Hank at the hospital. I’d been up late trying to figure out insurance claims for our car that was wrecked,
dealing with an injured father in law and then, we go to sleep and about 4 a.m., and I get a phone call.”
It was Misty. “I don’t usually answer the phone in the middle of the night,” she tells me, “but I did this time and heard everyone in the background yelling for Haleigh.”
They lay in bed for an hour or so, not sure what to make of it, not wanting to wake up her two girls, close to giving birth to a third. At about 6 a.m., “I woke up Timmy when we realized this was serious. I couldn’t imagine anything like this. I just figured she’s probably hiding in a closet. My kids hide from me all the time. Sometimes I’ll find them in a cabinet. To them, it’s a game.”
It was no game. Within hours, she’d raced back to Gainesville to pick up Misty’s mother and hightailed it back to the Sheriff’s Department, where she and Timmy joined the long line of family members for interviews, took polygraphs, and watched Ronald and Misty hand over the clothes they were wearing to police. “Ronald was wearing his company jumpsuit, like a blue work outfit that zipped up the front, and they both went in back and took off everything, including their underwear.” ~ end snip
http://www.artharris.com/2009/10/05/exclusive-inside-the-haleigh-cummings-family-feud/