How long should a silent treatment last?

My boyfriend and I had a fight yesterday. Normally when we fight, it's usually after a day I'm the one to say we need to talk. This time, he started the nonsense and he fought unfairly. I refuse to say anything until he says something first. How long should I wait for my boyfriend to "chill off" until I break it off if he doesn't say anything?
Updates:
+1 y
been two days now
How long should a silent treatment last?
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