Is This Box Big Enough?

I want to have two rooms, one flower, one veg; each room will have the same dimensions.
I was thinking 60 cm (2ft) wide and long per room
and 120 cm high (4ft). I was not sure if that would be wide enough or high enough.

I'll be growing white widow with 1 or 2 mother plants. Setup will be sea of green. It'll be between 3 and 5 flowering plants. It's going to be an ebb and flow setup with the bottom reservoir about 15cm (6in) high. I'd like to be able to obtain 2 ounces every couple months.

Any suggestions would be greatly appreciated.

That'll be fine for the mothers & clones but in the flowering room, unless u do a SOG kinda grow its a bit small for any more than 4 plants. Height could more but again its still an ok height as long as you dont veg too long

Im doing a similar setup with DWC. Ive got to fit a 400W HPS in there too. How long should the plants be allow to vegetate for?

I always thought it was 4-5 weeks veg 3-4 flowering although that will vary with different strains. SOG is lower start to finish but I don't know exact time, expienced grower will be able to give you a better answer.

Thanks for the advice. I plan on vegging 3 weeks or so.

Would I get a couple ounces with just 3 or 4 plants around 90cm?

I've heard of people putting them in flower a week after cloning and others 2 month after cloning. I guess it depends on how big you want it and how long you want to wait, but that's just my guess.