not that much; not very many
Том не так уж много выпил.
Tom didn't drink all that much.
Том знает не так уж много.
Tom doesn't know all that much.
В моей семье не так уж много мужчин страдали раком груди.
Not that many men in my family have suffered from breast cancer.
— Бойцовский клуб (1999)
Я не так уж много зарабатываю.
I don't earn all that much.