Holy cow, this is not bad for someone who didn't know what he was doing!
Welcome to this community. You won't regret this.
You wrote you set Detail to 3? 3.0? This is insanely high. For a beauty render normally 1.0 is enough. Maybe there are very rare exceptions where you may go a little higher, but remember even an increase of 0.1 units has a big impact on rendertimes.