All his updates are the same size, so it's up to those who like his work to measure the size they want and let a necessary amount accumulate. For example, I let 6 updates accumulate.
He always publishes 4 acts in his updates. Below is a summary of each update.
v0.39 Changelog
Acts 161, 162, 163, and 164.
170+ Images
1700+ Words
2 New Hidden Images
v0.38 Changelog
Acts 157, 158, 159, and 160.
170+ Images
1700+ Words
1 Animation
2 New Hidden Images
v0.37 Changelog
Acts 153, 154, 155, and 156.
170+ Images
1700+ Words
1 Animation
2 New Hidden Images
v0.36 Changelog
Acts 149, 150, 151, and 152.
170+ Images
1600+ Words
3 Animations
2 New Hidden Images
v0.35 Changelog
Acts 145, 146, 147, and 148.
170+ Images
1600+ Words
4 New Hidden Images
v0.34 Changelog
Acts 141, 142, 143, and 144.
180+ Images
1 Animation
1700+ Words