Depends how long your elapsed time between clone rooting and flip to 12/12 is.
Pots can be as small as 4" deep style for a dense bed of single-cola plants rooted and flipped pretty much immediately, to a Weedhound-style crazy 20 gallon DWC lol.
I would not go much over Icabod's 2 gallon cut pots for ebb n flow because of the risk of root rot with a large root mass. That will give you plenty of space to veg 2-4 weeks and flower a healthy plant.
I veg only until I am certain that the clones are growing upwards, about a week after roots appear, and then flower in 5.5" deep square pots of hydroton packed close together in the table.