Speech for 20mo old

Hi All. My son is not talking so of course I want him to have everything that will set him up for success. He started speech therapy this week (30 minutes on e a week) and I personally felt it was a waste due to his age. The entire 30 minutes he was exploring this new room. The therapist played with him and was teaching him a few signs when she could get the slightest attention. Anyone else's little started speech this young? Did it help? I know there's only so much you can do with a 1 year old.