Final answer:
The specific duration of Maranda's hemispherectomy in 'Gifted Hands' is not provided in the discussed resources, which instead focus on neuroscience topics such as split-brain patients, cerebral dominance, and the healing process.
Step-by-step explanation:
The question regarding the length of Maranda's hemispherectomy in Gifted Hands: The Ben Carson Story requires specific information that is not provided in the resources or topics discussed which focus on Michael Gazzaniga's work on split-brain patients and other related aspects of neuroscience and healing. The information regarding hemispherectomies in general, the dominant hemisphere in the brain related to handedness, or the healing process of an injury is not directly linked to the specifics of Maranda's surgery time mentioned in the autobiography of Ben Carson.