These can be very long cycles and may last for 30 years or more. Current furniture and cabinet demands are for oak. This is starting to change, however, to painted cabinets. A lower priced wood can be used which might shift the demand to soft maple and beech. Log demand cycles are more seasonal.
Mills try to reduce inventory in the spring because logs can spoil in the summer.
Sapwood can be stained by bacteria, fungi can attack woods left lay too long, and wood boring insects can degrade logs quickly. So, log inventories will be kept low in the summer to offset degrade. However, in the fall, mills will increase log inventory to prepare for poor logging conditions. This depletes timber inventory. If the winter is mild and dry, expect lumber prices to dip in the spring as mills saw up their log inventory.