What's the fastest recovery time of a tbi with 5 brain bleeds 3 skull fractures and a glasgow coma of 3?

Hard to predict: You are describing a very severe brain injury. Recovery time is hard to predict, but is never fast. The earlier you see any improvements, like increasing gcs, the better. And the faster that you see these improvements, the better. Recovery from an injury this serious takes many months to years, and most people do not return completely to the way they were.

Varies: The speed of recovery depends on the size and location of the brain bleeds and the skull fractures. Oftentimes, gcs of 3 may be the initial gcs but this may improve rapidly with resuscitation and neurosurgical intervention.