Not sure if you mean per year but mortgages are generally going to be over much longer time periods. A couple who I know are looking to buy somewhere new and are looking at getting £400k mortgage or thereabouts. With rates as they are now, and over 25 years, they’ll end up paying back £900k!
Pretty sure it is actually just the longest international border in the world. I guess Chile and Argentina might be close, maybe Russia and somewhere, but USA Canada I reckon is the longest.