it depends how serious the injury was that the person the longest time for someone to stay in a coma is about 1 to 2 years
it depends on the injury.
Three to eight days is concidered normal.
A nosebleed usually lasts between 5 and 10 minutes (if nosebleed occurs for more than 10 mins, help (ambulance) must be called).
Wormholes are only hypothetical and have never been observed. "While we do not have any direct experimental evidence for the existence of such objects, it is commonly believed that such objects...