Can I fit two plants in a 30 in. long, 45 in. tall, and 15 in. wide box? If so how much expect to yield?
Alright, well your yield depends on more then just the size of the container you wanna use. Experience plays the biggest factor. Lights, temps, humidity, other grow conditions... So its not really a cut n' dry question your asking.
The short answer is yes... You can probably fit two plants in there. You might want to look into some plant training techniques just in case space becomes an issue. What kind of lights/nutes/soil are you planning on using?