State the lead time everywhere
If the item takes four weeks, the page must say so before checkout. Hiding it is the misrepresentation risk, and it is also what generates the refunds.
Search over Shopping
Custom and made-to-order items often lack the standardised attributes Shopping wants. Search lets you speak the buyer’s language — occasion, material, personalisation — without fighting the feed.
Longer windows, fewer conversions
Attribution windows need to reflect a decision measured in weeks, and low conversion volume means manual control usually beats automation.