time from on it leeching ammonia is 2-4 weeks using a under gravel filter and 4-12 weeks using a regular filter. Doing massive water changes won't make it happen faster, it will just wear the buffer out quicker. The soil is loaded with ammonia and leeches out and that's that with the soil.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
Sump Pimp #2
My Tanks and my shrimps