If you have a concussion, up to how long can one be unconcious for?

Question

The maximum amount of time someone would be unconcious for.

Answer 1

From a few seconds (in minor concussion) up to forever (for a major insult to the brain). Even in minor concussions, it's really important to get checked out by a doctor. Some damage takes awhile to appear, you will feel fine afterward, and then have some serious problems.

Answer 2

The max is permanently.
That's how long someone can stay uncouncious with a concussion.