1 minute is getting towards prolonged, but remember in emergency situations time can be hard to judge. I'd say 1 minute of unconsciousness would be unusual though (and if you're regularly having people unconscious for 1 minute, you should really look at the way you are training).
However, by the time you've seen them go down,called for help, assessed their consciousness, assessed their airway, assessed their output and called for further help, that minute will be pretty much gone, so they'll be awake by the time you're starting to put them in the recovery position.