Is it too fast to get married to someone within a year of knowing them?

A lot of people can seemingly accelerate their relationship quickly and get married quicker than most people find appropriate. In this vlog, I answer the question, is it too fast to get married to someone within a year of knowing them?
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For more context, this was the situation a friend recently messaged me about:
A friend of mine has been dating this person for 4 months. They’ve decided to move in together and he’s talking about getting engaged within the next 6 months to this person and possibly getting married 6 months later. Theoretically, that means he would get engaged 10 months into knowing the person and married 1 year and 4 months.
To me, as a friend, I think that they have accelerated very fast and I want to have a conversation with him about the situation.
Do you have any thoughts on this and how to handle a conversation like this?
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