Well without telling us what type of soil. What type and size of pot. What type of light. What strain it is. What temps your at your not going to get much help.... I can tell you at 45 or so days from seed that thing looks beat and there's not going to be much saving it at this point. I...
Well lets see. 25g's in in 1oz. 16oz in 1lb/or 400g
figure your a shitty grower and getting 20g per plant hence you would need 20 plants or so to generate at least a pound
not sure about the space for that but a good size bedroom might work I guess.
these are rough estimates btw