How long do white diesel autoflowers veg for?

Can't really say. Most autos "veg" for up to 3-5 weeks before preflowering. They'll flower when they're ready. Varies from strain, phenotype and conditions.
 
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Cant find out anywhere..
Google the breeder and strain and I'm sure you'll find something.
I've never seen a breeder report the veg time of an auto. Usually they give seed to finish, or just flowering time.
In my experience by week 4-5 most are going into bloom.
 
They will preflower REGARDLESS of light schedule. Each strain has their own characteristics and will " go thru its change " on its own when it is ready to. The veg cycle can be quite short too.

Most of my AUTOS begin preflowers as early as Day 27 from seed to Day 40 and anytime between. Keep light schedule unchanged THRU-OUT entire grow.
 
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