Question about sex

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I've been wondering, for a normal man, how long does it take for him to lose his erection after ejaculating? Sometimes, people word it in a way as if the man loses it pretty much instantly, like a baloon deflating, but I found that thought funny and discarded it, knowing it was probably not that fast.
However, I still don't know the answer. I am asking because I recently heard about some men being able to maintain erection after ejaculating. I heard that that skill is rare and nice. I also think that I might have it. I can maintain my erection for a minute or five after ejaculating. The thing is, they never teached us this so I never tried continuing after having ejaculated. I thought all men were like this. But I'm still not sure if all normal men aren't like this, which is why I asked the question in the beginning.
I also apologize for sounding so formal, I have no idea what has got into me, I'm never like this.