I would not be that sure about that (although, admittedly I don't know the state of your hair, so maybe the timespan till all your hair is white is shorter than one might guess?)
Very basic geometry renders with all bells and whistles (refraction, reflection, complex normals, sheen effect, global illumination with both refractive and reflective caustics) in sub 2 seconds in the latest blender builds on a somewhat decent laptop with a RTX2080. The same thing would have rendered for a good minute on a decent machine a few years back.
And Blender is not even meant to do that realtime as it is not a game engine (anymore). So sure, going from 1.5 seconds to 1/60 seconds is a huge step, but similar steps have been made in a decade.
Very basic geometry renders with all bells and whistles (refraction, reflection, complex normals, sheen effect, global illumination with both refractive and reflective caustics) in sub 2 seconds in the latest blender builds on a somewhat decent laptop with a RTX2080. The same thing would have rendered for a good minute on a decent machine a few years back.
And Blender is not even meant to do that realtime as it is not a game engine (anymore). So sure, going from 1.5 seconds to 1/60 seconds is a huge step, but similar steps have been made in a decade.