"Custom made to order" means the factories assemble these products only after an order is placed.

The manufacturing time is up to 30 days but is sometimes shorter. The shipping time depends on your shipping country and the shipping method chosen at checkout.

The official FAQ says the following:

Custom Made-to-Order: the product can be ordered just like all other products, but is made-to-order and as such may require as much as 30 days to manufacture and ship. If you need a better shipping time estimation, please get in touch with us and we will provide the actual time required for that product.