The Crossing Point
The two power laws, Penrose-Hameroff of 1027/N5/3 and GRW Gaussian back-action of 1016/N cross at Nmax = 1017 at a time t of order of 0.1 second which is the duration of a moment of human consciousness.
L = (1/20) cm (approximately)
These estimates are only order of magnitude. We are in the right ball park.