300 steps with a minimum of 20 substeps = 6000 load increments and the solver seems to be taking 4 iterations to converge each increment, so you can estimate 24,000 iterations. Measure the time per iteration. Multiply that by 24,000 to estimate the time to finish.
You would be better off with just a few steps. That might allow the solver to take larger increments and reduce the total number of iterations.
You should also see if you can reduce the time per iteration by using fewer nodes. See if the Direct Solver or the Iterative Solver takes less time per iteration.