Average distance of stem between fan leave nodes?

Hello

I was wondering what the average distance (inches?) between the nodes of the fan leaves.

Basically I'm wondering how dense a plant should be with fan leaves/nodes.

My plants look good overall but I think they are some what stretched. So I'd like to just get a general idea of what they should be.

Good question, I'm wondering about this as well; specifically how much distance between each node is considered stretching?

I dont know the right distance between nodes but I look at the plants and if I have to move leaves to see the main stem its all good.