Well-said! That's what everyone should do!
I understand everyone does have a certain amount of lengthening in their mind, but in real life; you might not even be able to reach half of it unfortunately. So it is the best to listen to your body and lengthen as much as it allows even if it's only 3 cms. I have a certain plan too, but if i can't reach it i won't be disappointed.
I wish you the best!