By running the code, we get output telling us when we started each epoch, and roughly what our cost function value was for the last execution. For this specific task, we're only running it for 10 epochs and the results can be seen as follows:

2018/07/21 23:48:45 Batches 600
2018/07/21 23:49:12 Epoch 0 | cost -0.6898460176511779
2018/07/21 23:49:38 Epoch 1 | cost -0.6901109698353116
2018/07/21 23:50:05 Epoch 2 | cost -0.6901978951202982
2018/07/21 23:50:32 Epoch 3 | cost -0.6902410983814113
2018/07/21 23:50:58 Epoch 4 | cost -0.6902669350941992
2018/07/21 23:51:25 Epoch 5 | cost -0.6902841232197489
2018/07/21 23:51:52 Epoch 6 | cost -0.6902963825164774
2018/07/21 23:52:19 Epoch 7 | cost -0.6903055672849466
2018/07/21 23:52:46 Epoch 8 | cost -0.6903127053988457
2018/07/21 23:53:13 Epoch 9 | cost -0.690318412509433
2018/07/21 23:53:13 Run Tests
2018/07/21 23:53:19 Epoch Test | cost -0.6887220522190024

We can see that every epoch takes around 26–27 seconds on this CPU, an Intel Core i7-2700K.