Crafting

1. To make an item, you need raw materials worth half its purchase cost (round down).
2. To determine how many days (working 8 hours a day) it takes to make an item, divide its purchase cost in GP by 10 (round a fraction up to a day).

src: https://www.dndbeyond.com/sources/dnd/phb-2024/equipment#CraftingNonmagicalItems