Approximately how much bentonite shall I order?

I'm about to order liquid bentonite, and since the shipping costs a fortune, I'd like to make sure I order enough and I don't have to order again 2 weeks later. Can you guys give me some advice how much to order roughly? How much have you used up? If I order 2 quarts will that be enough? (I know everybody's needs are different, I'm just wondering how much you used!)
Thanks,
Skylah