According to a number of sources in the medical field, a significant injury to an artery located in an extremity is capable of causing unconsciousness and leading to eventual death in as little as ten minutes.
While I like revolvers, based on my experience, wheelguns—especially Snubbys—are actually about 20% harder to shoot well, excluding the more complex manual of arms of an auto-loader. That does not mean, however, that the Snubby is not still a viable weapon.