"Regular" SDDs can only be done within 5 business days apparently. Not that I would know, my bank certainly doesn't offer a magic money back button to their private customers, and as I remember it my contract only allows transaction reversal in case of identity fraud, basically.

As far as I can tell, SDDs are a B2B-oriented tool that can only be initiated in particular circumstances such as a merchant being unable to fulfill an order altogether – i.e. when the legal case for a breach of contract is so unambiguous that it isn't worth either party's time to go to court. That's very different from the American thinking of "my hotel room wasn't as clean as I like it so I'm going to do a chargeback because that's my Visa-given right".