How long should I wait to unblock him?

Me and my boyfriend have been on good terms until about 6 hours ago we got into an argument. Im not going into detail about it but he said some hurtful things so I blocked him on social media. We've been through this before in the past, he would block me for a couple of hours or a day or 2 at most. I don't want to wait long, I'm very upset with him. How long should I wait to unblock him? I don't know if he's cooled off yet.
How long should I wait to unblock him?
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