My broccoli was fairly soft after boiling it for 3 minutes (I cut it quite small). Do 1-2 minutes if you prefer more tender-crisp. It also depends how small you chop the florets, so it’s a good idea to test one piece prior to draining the pot so you can cook it for a little extra if needed.
One pound of broccoli should easily yield 3+ cups when cut into florets.