wasn't it 300 blocks per biome
For meteorite its 50. For Mushroom and Hallow, its 100 hallowed blocks, so sand, ice, and stone and for mushroom its 100 grass blocks combined with mushrooms
Its 200 for all "Evil" biomes, and it includes "Evil" plants too.
Desert is 1000 sand, ocean is 1000 blocks of water, Snow is 300 Snow/ice blocks.
Jungle is 80 grass, vines, lihzahrd bricks (though using 80 lihzahrd bricks will spawn temple enemies)