It looks like 48 hours...which is still long, not sure how long dogs can pick up a scent of a person.
TIMELINE OF SEARCH
Sunday
» 3:40 p.m.: Kayleah Wilson says goodbye to her mother, April Wilson, and leaves the apartment in the 2800 block of 28th Street. She's walking to meet a friend south of the Greeley Mall, then to go to a birthday party. It's likely she crossed U.S. 34 Bypass to get to the Greeley Mall.
» 10 p.m.: Discovering Kayleah did not make it to the party and did not return home, April Wilson calls Greeley police to report her daughter as missing. As is standard with missing older children Kayleah is 12 police handle it as a possible runaway and put out an alert to watch for her.
Monday
» Morning: Greeley police officers discuss the case, canvas the area and learn there is no indication that Kayleah is a runaway. Police spend the day questioning the family and friends of Kayleah and contacting possible witnesses in the neighborhood and the area south of the Greeley Mall.
» Police request an Amber Alert through the state, but are told the case does not meet the requirements. Her name and photo are placed on state and national missing children sites. There is no evidence of her running away, nor is there any evidence of foul play.
Tuesday
» Morning: Search dogs are brought in but are unable to pick up a scent of the girl. Detectives decide it is time to send out a press release.
» 2:54 p.m.: The first press release with Kayleah's photo and description is e-mailed from the Greeley police to media throughout the state; police increase the number of officers and detectives working on the case. The FBI is asked to join the investigation.
Wednesday
» 9 a.m.: There are now 25 officers and detectives working the case. They search U.S. 34 Bypass near the house, looking through ditches, culverts and bushes. No evidence of Kayleah is found. About the same time, April Wilson passes out fliers of her daughter at Greeley West High School.
» The FBI sends agents to meet and join the investigation with Greeley detectives.
» April Wilson spends much of the day at the Greeley Police Department, trying to help find her daughter.
http://www.greeleytribune.com/article/20100401/NEWS/100409979&parentprofile=search