Computing resources required for kernel development

Hi everyone, I have been following the Kernel Hacking steps to submit my first patch but I am facing problem in the kernel compilation as its taking more than a day may be due to low computing resources.. I have Ubuntu 20.04 LTS with 4GB DDR3 ram 1 TB HDD, Intel i3 2.GHZ and 4 cores but I have been using virt-manager for the kernel development with CentOS 8.1 (minimal req.) and resources 70 GB storage, 2 GB ram and 2 cores. Thus if anyone could suggest how much computing power to have or any other method so that I could make my development process smooth.