First, this would be a better question to ask in a Linux specific community.

Second, Build time is really subjective to the computer and its hardware. There could be bottlenecks at the cpu/memory from the motherboard that will slow it down. It also depends on whether you’re spinning rust or using an ssd.

There are a lot of factors involved in the whole that makes it hard to definitively say how long something takes to build.

One thing to look at is you are self-hosting on a local tower turned server.

If you are using a hosting provider, most of them offer domain name registration through their company.