Are bouncers ok for newborns to spend most of the day in?

Hello all!! first time mommy with many questions.. my 8 week old daughter doesnt like her crib she only sleeps in it at night when we swaddle her and spend hours putting her to sleep.. during the day she like to be in my hands and in her bouncer only!! she spends too much time in it i think and i am concerned. she spends somewhere between 8-9 hrs a day in it.. is it healthy? is it safe? because iput a blanket and a magazine so her back could be more straight but i still notice that her shoulders look more out hunched back a little like shes not straight, i dont know if this is ok at this young age for her to sit like this all the time.,. i need some advice please.. thank you all!! i know when she gets a little bit older shell be crawling and doing other things but till then can i keep doing this? i havent asked the ped yet, but will next week at her appt..thank you all!!