Hell I’ve seen 30 days. Sometimes they are using a third-party - it still should be almost immediate these days.

Fraud. It takes a while for them to receive the funds even though they are charged against your account almost instantly.

Privacy Browser

I expect they think that a significant percentage of people that have Internet also have a smartphone. They probably aren’t far wrong.

They are: ping 0xC0.0xA8.1.1 or 0x7F.1

Standard scanf number parsing is generally used though some OSes reject that.