I started like that (just sleeping with it and doing 1-2-3h bosom beauty during the day), but at some point I wasn't satisfied with my progress and then I started doing it 11-12h on workdays and marathons on weekends. Everyone reacts different, try and see, you can always add hours if you are not satisfied.
I am also the category slow responder according to brava - very thin, no weight loss, no kids. I think its more then just these 2 criteria, they actually only tell if your skin is already stretched, but I think there is more than just that. I find it more important how your body actually reacts to the vacuum therapy, if you can get large swelling and if you keep it for a long period of time. Even if you had no kids some have skin that stretches more, some get stretching marks, some don't, its about the type of skin, even if you had no kids, if your skin is very elastic it doesn't make that much difference if it was stretched before through pregnancy, in that case the skin doesn't prevent the tissue, vessels inside from getting bigger, in my humble opinion.. But your size makes you a slow responder, 5cm difference isn't much, so there is not much tissue to stretch and multiply
I am also the category slow responder according to brava - very thin, no weight loss, no kids. I think its more then just these 2 criteria, they actually only tell if your skin is already stretched, but I think there is more than just that. I find it more important how your body actually reacts to the vacuum therapy, if you can get large swelling and if you keep it for a long period of time. Even if you had no kids some have skin that stretches more, some get stretching marks, some don't, its about the type of skin, even if you had no kids, if your skin is very elastic it doesn't make that much difference if it was stretched before through pregnancy, in that case the skin doesn't prevent the tissue, vessels inside from getting bigger, in my humble opinion.. But your size makes you a slow responder, 5cm difference isn't much, so there is not much tissue to stretch and multiply