Earlier quoted context omitted.
NPP is a joke. There's a limit of $1,000 for transfers. It doesn't always work if you don't use a PayID. Compare that to Faster Payments which easily works with 250k with or without a PayID
If you regularly need to move 250k sums electronically inside the Australian economy, using this kind of mechanism, I'd love to know what you're doing. Only because I am nosy: I cannot conceive of transactions on this level which demand NPP class behaviour.
Paying sub-contractors, settling property transactions, the list goes on.
When buying a house, I remember having to withdraw $60k in cash from my savings bank account and walking over and depositing it in another because it would take the other bank 3 working days to clear a bank-cheque. Some banks do offer an over-night inter-bank mechanism, but surprisingly CommBank does not.