I do most of the automatic laundries in our home. I like the “nothing added, no smell” washing machine soaps. Several brands advertise that their 32oz bottle holds enough soap for “32 loads.”
I think this is a clever advertizing trick. Each bottle comes with a lid that you pour the soap into, to transfer a measured amount into your washing machine. Just fill the lid up and you’ll get about sixteen loads. But there’s a faint line way down inside the lid. Be very disciplined and fill only to there, and you get 32, just as advertized. And we’re talking discipline here, as in: be very careful not to overfill the lid, every single time.