This took 40 minutes on pretty high render and light quality settings, as someone completely new to Carrera I'm quite impressed with my first render :-)

The hair colour has a hint of purple in it which looks a little strange and there is clearly something of an issue with texture banding or antialiasing of the hair but overall a very good first effort without any tweaking

V4.1 and hair imported from a pz3 (once I'd found out to delete the lights)
Default scene with one extra light but no other tweaking

AMD FX60 dual core with 2GB RAM