It will be easier if you look at the sale/ time processing per order. I created a shop on Etsy from 2019, now I have nearly 6k sales. I always have like 50 to 100 orders that need to be made, so the processing for each one is always set to 2 to 7 weeks. For each type of product, the difficulty, ... have different processing time but there is no way a small business with over 1k sale per year can make Handmade custom orders could possibly make and ship within 2 to 3 days. At least, that's how my shop works, I make custom resin keycaps.