Crop cycles differ a lot. Paddy straw finishes in 4 to 5 weeks. Oyster takes 45 to 60 days. Button needs 80 to 100 days on the same straw once composting is counted. Shiitake blocks need 60 to 80 days of spawn run before the first mushroom.
Skill rises in steps. Oyster is the usual first crop: no compost, no casing. Milky adds a casing layer of soil. Button adds composting, casing and a cold room. Shiitake adds sterile bag filling and patience. Paddy straw is fast but the most perishable: DMR says it cannot be kept at 4 degrees because it breaks down, and is sold on the day of harvest.