there is no "normal" time my friend. since i don't know if you are writing as a concerned man with a short fuse or a disappointed partner i will try and be blunt. i assume you are asking about "too quick" since very few people complain if the sexual act goes to long. levels of excitation will vary and a man is likely to climax quickly when he is a high state of arousal. so what? just plan on going for a second round a bit later which will most likely take longer and may be more pleasurable to your partner. if you are a disappointed partner then insist on prolonged foreplay to the point where your excitement level matches your partner and then go for it. again second rounds tend to last longer so just cuddle a bit until both of you are ready to go again. don't judge the sexual act based on the clock but rather the level of intimacy you have with your partner.
what is considered a "normal" amount of time to engage in sexual intercourse before ejaculation?