Not my fault your calculation for a 4 hour recompile depends on having zero parallelism, in a year where 16 core processors are easily available and blocking IO is still a thing. So yes it will probably turn several hours of waiting into a short coffee break, the few times you need a full recompile.
The math for my 4 hour compile didn't take in to account parallelism, the 2 hour+ builds however do, and were built on a 16 core CPU with parallel builds enabled. It's not turning in to a short coffee break.
