My project [0] is about 600k lines of C++. It takes about 5m40s to build from scratch on a Ryzen Threadripper 2950X, using all 16 cores more or less maxed out. There's no option in C++ for meaningiful incremental compiles. Typically working compiles (i.e. just what is needed given whatever I've just done) are on the order of 5-45 secs, but I've noticed that knowing I can do a full rebuild in a few minutes affects my development decisions in a very positive way. I do 99% of my development work on Linux, even though the program is cross-platform, and so I get to benefit from lld(1).
The same machine does nychthemeral builds that include macOS compiles on a QEMU VM, but given that I'm asleep when that happens, I only care that the night's work is done before I get up.
The same machine does nychthemeral builds that include macOS compiles on a QEMU VM, but given that I'm asleep when that happens, I only care that the night's work is done before I get up.
[0] https://ardour.org/