They could improve that speed if they had more hardware to do the needed rebuilds.

I hope you are paying them something.

You don't have to wait? You just have to compile matter yourself

Ask your favorite LLM to write an overlay for whichever package you need patches applied for before they hit Nixpkgs.

Use nixos-unstable-small branch or backport the change and build yourself.

There needs to be another repository with less stringent standards, nixpkgs should be for core libs and system applications