Sativa stretch can be pretty brutal. Here's an amnesia auto at pre flower and then again 3.5 weeks later.
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That's in a 3x3.
Here's a strawberry cough at flip (stretch just started)
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After stretch (in a 3.3x2 tent)
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Just a quick reference on average sativa dom hybrid stretch. I'd flip soon if you want to keep all four in there.
All up those above vegged for three or so weeks before either auto flowering or flipping. I usually flip when I see pre flowers.