To top or not to top?

I only grow autos and I top them all. I wait until I can have at least 1/2 inch of stalk after I snip because it encourages fat knuckles at the top which will help the top nodes withstand some training.
So how do you know exactly when to stop the veg nutrients. I'm moving into week 6 and don't want to stop the stretch too early.
 
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