ICAR-DMR publishes three ways to make button mushroom compost. The long method takes 28 to 30 days with 7 to 8 turnings and needs no pasteurisation room. The short method takes 16 to 20 days in total, of which 10 to 12 days are outdoor Phase I. The indoor method runs 10 to 12 days in total, with only 6 to 8 days of Phase I inside an aerated bunker.
The route also changes what the straw gives back. DMR reports 1.75 to 2.0 tonnes of finished compost per tonne of straw by the long method, and 3.0 to 3.5 tonnes by the indoor method.