Let's compare. I just checked out ripgrep and built it and all its dependencies from scratch. Total time to produce a debug build: 6.92 seconds. This is inside a 16GB VM on a random Linux laptop (on battery); no beefy hardware here.
Let's try something beefier. I just checked out uutils (an implementation of coreutils) and built it from scratch. Total time to produce debug builds, for eighty binaries and all their dependencies: 30.26 seconds.
Let's try something beefier. I just checked out Servo, an entire browser engine, and built it and all its dependencies from scratch. Total time to build and link its one-thousand one-hundred and ten compilation units (along with its infamously huge and serial servo-script bottleneck) into a binary: 4 minutes and 38 seconds.
If Codex takes 45 minutes to build from scratch, that's an indictment of OpenAI and their development processes.