How many plants could I fit in there?Way too young to flower, should veg for at least 4 to 5 weeks, even more for a good yield.
How many nodes should I let it get?It is a thing called 12/12 from seed but 1-2 weeks for veg is okay for small spaces,3-4 weeks will outgrown anything small even with training.
Me personally use 12/12 from seed and my plants get about 2 1/2 feet tall even with training but i use a 400w hps for vegging now since the 400w mh puts out more heat than light.but to answer your question about 4-5 nodesHow many nodes should I let it get?