Earlier quoted context omitted.
> The build takes about 30-45 minutes If you don't actually need all the drivers, you can use "make localmodconfig" to substantially reduce that. My local kernels build in 90 seconds on a 32-thread desktop machine :) The kernel is a lot more stable than people think: I run the daily linux-next on my Debian stable gaming PC to look for bugs, and I don't find very many.
try to build it with make clean first
{0}[calvinow@sousa ~/git/linux] git describe
v7.1
{0}[calvinow@sousa ~/git/linux] git clean -dffxq
{0}[calvinow@sousa ~/git/linux] zcat /proc/config.gz > .config
{0}[calvinow@sousa ~/git/linux] time make -skj32 tar-pkg
'./System.map' -> 'tar-install/boot/System.map-7.1.0'
'.config' -> 'tar-install/boot/config-7.1.0'
'./vmlinux' -> 'tar-install/boot/vmlinux-7.1.0'
'arch/x86/boot/bzImage' -> 'tar-install/boot/vmlinuz-7.1.0'
real 0m56.539s
user 18m41.863s
sys 2m8.754s