You will have to set up a whole load of drivers and shit for a long time.
I custom built a lightweight pc with the intention of installing ubuntu (this was quite a long time ago). After about 4 hours of unsuccessfully attempting to install 16.04 and trying all sorts of fixes I discovered that it was incompatible with the motherboard. So I had to downgrade to 14.04, reburn the disc, install again, which took another 30 minutes to an hour. After that, it took another couple of hours to get the runescape client, right java version, and some miscellaneous stuff (drivers, blahblah) to get set up. You will end up with a lot of stackoverflow pages open with the "best answer" completely useless. Ubuntu is also considered one of the more user-friendly distros.
The hours do add up. If you are a casual user then don't go with linux. If you aren't a casual then it might be different.