2 plants under t5 then 600 watt what size hard pot?

I think I’ll veg 6 to 12 weeks. northern lights

6 weeks ought to be plenty then 4 -5gal pots are my preference. That's using ProMix HP with hydro nutes so I may just go with the 2.5gal pots I have lots of. I tend to veg too long so going to start flowering earlier so they stay smaller.