Writing in the Accident Analysis and Prevention journal, a team from Tampere Institute of Technology reveals the results of a study in which 6000 people were asked if they had actually had any kind of accident - or had nearly had an accident - while using a mobile.
  yes. they are called wet dreams. when a man sleeps hes usually dreams about sex, so when you have sex you ejaculate in there dream they are having sex.
To my knowledge these times can vary. Some men just ejaculate faster then others. It depends on the sexual drive that your partner has. Some men can be healthy and ejaculate in 5 minutes and others could be healthy and ejaculate in 2 hours. Men can learn to hold back their orgasms until their partner is ready.