How long after you start dating should you become monogamous?

How long after you start dating should you become monogamous?
Updates:
1 mo
To the people who said from the beginning you should be monogamous In dating, how do you tell the person they are your boyfriend or girlfriend after one date?
No shade
I just don't understand how you would become an immediate SO?
How long after you start dating should you become monogamous?
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