Build has become extremely slow.

I have, this morning, done some minor refactoring. My build now takes 166.06 seconds. The command that it seems stuck on is:

/home/me/Development/UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v25_clang-18.1.0-rockylinux8/x86_64-unknown-linux-gnu/bin/clang++ @/home/me/Development/my_project/Intermediate/Build/Linux/x64/UnrealGame/DebugGame/MyProject/my_code.cpp.o.rsp

Are there any known gotchas to code structuring? I am getting more C++ build errors than show in my terminal history. Is it just taking a really long time to handle those errors?

If I interrupt, how do I get the build errors that have occurred up to that point?

Build time is only 15.69 seconds without build errors. It would be really good if I could interrupt and get the log.