> Their "build server" ran overnight, you'd check in your code in the late afternoon and get your compile errors back in the morning.

This. Let's keep things in perspective when people complain about long Rust compile cycles. And even that's a whole lot better than filling in paper-based FORTRAN or COBOL coding forms to be punched into cards in the computing room and getting back line-printed program output (or a compiler error) the next week.