  Experiments on spin glasses can now make precise measurements of the exponent
$z(T)$ governing the growth of glassy domains, while our computational
capabilities allow us to make quantitative predictions for experimental scales.
However, experimental and numerical values for $z(T)$ have differed. We use new
simulations on the Janus II computer to resolve this discrepancy, finding a
time-dependent $z(T, t_w)$, which leads to the experimental value through mild
extrapolations. Furthermore, theoretical insight is gained by studying a
crossover between the $T = T_c$ and $T = 0$ fixed points.
