Final answer:
An acute subdural hematoma typically presents hours to days post-injury and requires prompt medical treatment to avoid severe complications.
Step-by-step explanation:
An acute subdural hematoma (SDH) generally presents within a time frame of hours to days after a head injury. This condition is characterized by the collection of blood between the dura mater and the brain, often leading to increased intracranial pressure and the potential for serious neurological damage. Prompt medical attention is crucial for the treatment of an acute SDH to minimize potential brain damage or other serious outcomes.