How long should you date before marriage?

How long is the time the average person thinks of before deciding to go from the dating stage of a relationship to marriage. Obviously this number will be different for most and can change depending. But just a rough answer. I've personally thought 9 months is a good time maybe too tell. But I could be so far off from others
0-3 Months
3-6 Months
6-12 Months
1-2 years
2+ Years
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How long should you date before marriage?
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