This even isn't the absurd part. If you increase the backlog time you are building for, then it's a one-off increase, it doesn't increase the quantity of new w

This even isn't the absurd part. If you increase the backlog time you are building for, then it's a one-off increase, it doesn't increase the quantity of new work coming in, so once they've worked through this one-off extra with their 10% spare capacity, things will just go back to how they were before.