i have around 10 varieties in my container, and i got about 2 cups of basil minus the stems i cut off.
that's around probably 30 plants all in all. (planted close together in plastic cups then transplanted to it's current container)
you'll need A LOT of basil plants go get a pound worth. lol.
i dunno, my plants are 2 months old and around 13 inches tall. i cut it back by half.
here they are now:
for reference, the thai basil there to the right is the original height of all the other basil plants.
i have since ammended the soil with coffee grounds and spraying with some organic foliar fertilizer