Earlier quoted context omitted.
I believe it is 24 hours for the first, then instant after that.
What a coincidence, a fraud protection scheme that happens to make NPP unsuitable for retail payments right off the bat. Surely unintentional and nothing to do with banks and credit cards wanting to preserve their racket of skimming every purchase in the country.
I think the biggest barrier to adoption for retail payments is a visibility issue - most people I've spoken to have no idea what Osko or PayID are.