Once hitting about day 15, Customers begin to demand things at 40 seconds or less. Being level 7 with strength 5, creating a one handed hammer takes at least 10 hits, and that usually gives me about 5-10 seconds left to make the hammer. Usually that ends up with me losing up to three customers and using the spare parts to satisfy the next.
Making a greatsword in time is nigh on impossible when made from scratch, and it's absolutely impossible to satisfy a customer if you're dry out of ingots when they arrive.