There are no statutes regarding this. It is strongly recommended that you consider the child's maturity, comfort level of being left home alone, and what to do in case of an emergency.
Children age 7 and under should not be left alone for any period of time
Children ages 8 -10 not more than three hours
Children ages 11 -13 not more than 12 hours
Children ages 14 - 15 not more than 24 hours
Children ages 16 - 17 may be left alone for over 24 hours with a plan in place concerning how to respond to an emergency.
Reports alleging inadequate child care arrangements may be screened in for a child protection response according to the following guidelines:
Children under age 11 should not provide child care
Children ages 11-15 who are placed in a child care role are subject to the same time restrictions of being left alone as are listed above
Children ages 16-17 may be left alone for more than 24 hours with adequate adult back up supervision.
Note: If children are left alone at the time the report is received by the local child welfare agency, and the circumstances fall outside of the timelines listed above, the local agency may refer the matter to local law enforcement for a child welfare and safety check.