Have you ever had one take longer than zero time?
I've had instances where it's taken more than hour, although it usually is as near instant as physically possible.
I have accounts with two banks (one for personal, one for joint finance with my wife) and FP makes that so easy to manage, if the joint account needs topping up I can do it in a minute or two on my laptop or phone.
SCT inst is gradually coming. Bear in mind the SEPA area covers some 500 million people, it's no small feat compared to much smaller domestic markets (Nordic European countries have been ahead of Australia in this regard).
Inter-country and intra-country transfers are all identical (all running via SEPA) and should make no difference.
SEPA transfers are legally limited to 24 hours already.
SEPA ICT is being rolled out right now, from summer on most banks should support it, which transfers up to €15'000 in 10 seconds.
As another commentator pointed out, the UK it's instant, now it turns out in Germany it's also instant.
That's 150 million EU citizens.
You shouldn't make assumptions that whatever happens in your country, it happens for the rest of the EU.
Here's Holland's transfer times:
https://hoeveelkrijgjij.nl/blog/belastingen/hoe-lang-duurt-g...
That's another country that takes less than 24 hours. I picked them because when I often visited there as a child they seemingly had chip + pin way before the UK, so I assumed they'd be quite advanced. Not quite so as advanced as UK/Germany though. My Dutch isn't great but it looks like it's same day as long as it's before 15:30 on a working day, otherwise next working day. France I'm struggling with as google is obsessed about giving me UK to France bank account wait times.
I've done hundreds of transfers, sent and received.
In fact, frequently I transfer money to ny parents, or they to any of my accounts (they use commerzbank or postbank), and usually within of 10 minutes my phone gives me a push notification that the transaction has completed and the money is there.
And often banks have copperations, where, between cooperating banks, transactions already run much faster.