Of course it depends on how many modules, etc, but it’ll probably take 1-1.5 hrs for the kernel and maybe 3-4 hours for the modules, and even make deps will probably take 30 minutes. With more RAM these times would improve considerably.

How is the Linux kernel built?

The Linux kernel has a monolithic architecture, which means that the whole kernel code runs in kernel space and shares the same address space. … Once a kernel module is loaded, it is part of the monolithic kernel and shares the same address space of the code that was included at kernel compile time.

How long does Buildroot take to build?

Thanks to its kernel-like menuconfig, gconfig and xconfig configuration interfaces, building a basic system with Buildroot is easy and typically takes 15-30 minutes.