Let her sleep or wake her up for feeding???

Hi everyone , My lo is a week old now. She is being breastfed since day 1. Her birth weight was 3.54 kg .. she then lost some weight and then gained back a little. Today is the ninth day and she is 3.28 kg. The doctor told me she shud come back to her birth weight by tenth day. I’m so doubtful abt that. But there is no problem with her feeding. Her pee count is normal. Only thing is she continuously feeds for long duration. Like 30 mins on one breast and then she poops or pees and then another 30 mins on other breast and then again.. so it’s like a duration of 1 and half hours almost till she falls asleep. And she sleeps for 4 hours at a stretch.

My question is shud I wake her up every two hours anyway and keep feeding or let her sleep. Because she seems so satisfied after feeding sessions that I let her sleep for long. But doctor advice was to feed every two hours. I’m confused. Pls help