Each week I usually build 101 kernel packages to go into my APT repository for Linux-libre (see https://jxself.org/linux-libre). This comes from building all supported kernel versions across all supported architectures. This number doesn't include the packages built for testing before the actual releases happen. I have setup 2 more machines to help with kernel compiling, for a total of 4, and can now do the equivalent of make -j128 across the 4 machines.