Is that the short description? It looks good enough to me, as it communicates the info right upfront.
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Here a somewhat pointless rambling:
I have being thinking about this question of yours…
I kinda contemplate the option of having some sort of shipping classes and see if can work it that way… no sure about that solution neither…
What I realize is that you are talking about manufacturing time… and this is field that is not part of woo-commerce… there are ways to create custom fields, such as plugins and the so… but… to link them to the product count…
I think part of the problem is that people usually don’t want to punish costumers for buying more, so nobody have develop plugins for that effect… most of what I find is for instance reducing the price of the product as the quantity increase… stuff like that… trying to motivate them to buy more.
I get it you are manufacturing on a pulling fashion, you have not stack and create the product as the orders are placed… what would you do if 10 costumers place orders of 5 each? are you still going to deliver within 5 days the 50 of them? or your process is maxed out this way?
In that case I would just suggest to email the costumer with the schedule time for his order.