How fast do credit card companies report changes?

I have paid down some balances already for some time but the changes are not appearing on my credit report. I’m not pulling up my credit however, I have alerts when my scores go up or down or if there’s inquiries etc. Do I have to ask them to report the change in balance? Why is it that when you rack up a ton of charges they report them really fast but when they’re paid off, they take forever? Is there a way to "speed up" the process?

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