How long should I give him to cool off?

My boyfriend and I got into a hugeeee fight yesterday. It was almost entirely my fault and I feel bad. But he also acted really badly. He yelled, cursed and told me not to call him. We have been together for 2 years and recently we have been fighting a lot more. He is going through a tough period which doesn't allow us to see each other very often. It has put us through a lot of stress. He hasn't contacted me since yesterday. I am worried a bit, I want to make sure he got home OK yesterday. I don't even know that. And I know he needs time to cool off and will be OK after. But how much time? It's been 24 hours. I'm getting anxious. Do I call? He usually sleeps off his anger and is OK the next day.
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I really messed up ... but he acted so angry. I was scared and started crying.
How long should I give him to cool off?
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