For how long could he have been expelled?

Back in early February 2024, a classmate of mine got expelled of the school for being verbally abusive towards teachers while doing a final exam, he basically insulted them screamed at them and started crying hysterically and since then they have kicked him out, but for how long could he have been expelled for, forever, or for a certain amount of times?

For how long could he have been expelled?
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