The crafting speed needs to accelerate based on the amount of items being crafted. If you craft a low number of items, or "high quality" items, keep it slow, but if your crafting 99 items, allow the speed to increase based on the amount of number crafted.
As it is now, I craft 99, and then go get some coffee,
See guild wars 2 crafting on you tube for an example of accelerated crafting.
