it depends on your printer as you can see is not because of Tito that your printer is slow it must be the parameters in your slicer software as recommend in the description just use middle quality parameters and it will be ok, 4 hours should be more than enough time to finish the 3D printing of the Head.
So maybe you have settings for high quality now.
hope is helpful welcome to the community!
Soon i will launch some videos to solve all kinds of issues related to biped opensource robots like Tito & Otto.
please subscribe https://www.youtube.com/ottodiy