Help diagnosing please!

So I'm running my gelato auto from fast buds it calls for 56 days I'm on 67 days and it's clearly not ready it's more in mid flower. I'm noticing some leaves turning colors I wanted to ask if you run into a toxicity or def does that start at top of canopy or bottom of plant? And is this the plant showing its starting yinyellow out and show some color in leaves since in getting twords the end of its life? It was just watered with molasses about 2-3 days ago and is organically grown in Coco loko and mother earth dry amendments. Jan 31 was it's last top dress with bloom amendments.

I just noticed that the first light in the daisy chain is staying on just barely noticable. This grow is feminized, so do you think its bothering the plants at lights out?

How long do most people keep their plants in veg? I suppose it depends on grow space and strain. It seems in most of the reading I’ve done, 8 weeks is the average?