It typically takes more than 20 hours on my dual core laptop. It's a pain, but once compiled I get the best of both worlds: fast as chrome, privacy friendly as firefox.
EDIT: Looks like popularity is on the rise [1]. Hopefully it will make it into the community repository.
EDIT: Looks like popularity is on the rise [1]. Hopefully it will make it into the community repository.
[1] https://pkgstats.archlinux.de/packages/ungoogled-chromium