Installation procedure
It tends to be a learning experience with distributions like these.
Gentoo’s installation procedure is one of the most complex we’ve come across, and it’s largely carried out manually with little use of helper scripts. Because it’s a source-based installation, you can end up waiting for, say, half an hour while certain packages are compiled and installed. If you choose the wrong option, this obviously adds to the time. We reckon that a user who understands manual partitioning and compiling the kernel would typically need a couple of nights to install the system. A less advanced user might need a week.