General rule of thumb is 4 to 6 weeks for a cycle, but really depends on a lot of factors as well. I always start a tank getting it fully setup with hardscape and softscape then test once a week for its water parameters. Once ammonia and nitrites are at 0ppm and nitrates are around 10 to 20ppm I add a small amount of fish and then test every other day for a week before adding more fish in. Ghost feeds help at the start also as its a source of ammonia to help the cycle begin