Maybe in the US it's simpler, but recently I had to do a chargeback on my Polish credit card and first of all I couldn't even initiate one until the transaction was fully processed(while it was only showing as "pending" on my account), so that took 3 days, then I could file a chargeback by making a complaint about a transaction, which I was then told would be "reviewed in no more than 2 weeks" and that is genuinely what happened - the transaction was reversed and the money returned but it took the full 2 weeks from the day I requested a chargeback.