it really depends on how big of a container you were thinking
also...
and how big you wanted to grow them... If I run out of space, sometimes, I double up clones in my one gallon buckets, [I only can fit 20 buckets] I can tell you first hand that if you are only going to veg a plant a short time, they would not grow large enough to be root bound...together in any container over one gallon...I have seen Sog grows with plants in one liter bottles, and two plants 'sharing' a one gallon worth of soil, would be a larger cubic inch amount...anyway... on plants veg only 6 weeks or less, I got double the yield, as for one plant in one gallon...people always say don't do it... I did it, with a exact same result... So, "How Big/How Long to veg" is the question...