Can a magnifying mirror be practical as a reflecting telescope’s primary mirror?

I can't find any good scope seller or an optical shop in our place that sells customizable mirror. I'm planning to buy a magnifying mirror and use it as a reflecting scope's primary mirror. I've heard that the focal length might be short. How short is an average focal length of a magnifying mirror? Is it too short to be used in a telescope or passable as an average quality scope mirror? I haven't bought one and measured it.

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