Needing breast feeding answer /advice!

So my daughter is 1 weeks and I feed her every 3 hours or sooner, but I always have to wake her up to feed she only wakes up by herself sometimes. When I do wake her up i try getting her to stay up to feed but sometimes she only last 5 mins or less on one boob. And then she passes out in a hard sleep no way of getting her to wake up. I really hate putting her back to sleep if she ate little bit. But my question is, is it okay to feed her for 5 mins on one boob and then put her back to bed and then wake her back up in 3 hours? I know doctors say to feed on both boobs for Atleast 15 mins each boob but she doesn’t last thay long . And sometimes I worry. Needing some advice as well. New time mom.