Ceramic Substrate PCB Lead Time: What Can Affect Production Schedules?
A ceramic substrate PCB usually ships in three to five weeks for a standard order, though honestly that number moves around a lot once you factor in material, layer count, and just how packed the factory's schedule is that particular month. So if you're locking in a launch date or promising something to a client, don't treat that window as gospel - pad it a little, especially if anything about your design is custom.
Read more - https://articlescad.com/cerami....c-substrate-pcb-lead