We could also combine this with the rate of growth of investments. In that case we would end up with a total rate of growth of effective compute equal to gH+gI+gS≈0.28+3.84+0.54=4.66. This results in an optimal training run length of L=1/(gH+gI+gS)≈0.21 years, ie 2.52 months.
Why is g_I here 3.84, while above it is 1.03?
This is actually corrected on the Epoch website but not here (https://epochai.org/blog/the-longest-training-run)