For the BOP (Binds when picked up) gear, it mainly depends on the drop rate. Every week we will take customer's character to the desired dungeons. If we have completed the raid the week when customer purchased, the new order will be started in the next week.
Sometimes, some gears are in queue. To customers who are waiting in queue, usually we have two solutions: take the characters to dungeons obtaining some Emblems,or return the characters to customers until we can start.