The number of hours of Applied Behavior Analysis (ABA) therapy that a child with autism may need can vary based on the individual child's needs and the goals of the therapy. Typically, children with autism will receive between 10 and 40 hours of ABA therapy per week, although some may require more or less depending on their needs.

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The duration of ABA therapy can also vary based on the individual child's needs and progress. In general, ABA therapy is a long-term intervention that may last for several years, particularly for children who begin the therapy at a young age.

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The therapist or behavior analyst will work with the child and family to develop a treatment plan that outlines the specific goals of the therapy, the number of hours per week, and the duration of the therapy. The treatment plan will be tailored to the child's individual needs and abilities, and may be adjusted over time based on the child's progress and changing needs.

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It is important to note that ABA therapy can be a significant investment of time and resources for families. However, research has shown that intensive ABA therapy can lead to significant improvements in a child's behavior, communication, and socialization skills, as well as their overall quality of life. Families should work closely with their child's healthcare providers and ABA therapist to determine the appropriate level of therapy for their child.