how much sleep for almost 8 week old?

I feel like my daughter sleeps soooo much and I'm not sure if i should be concerned. She'll be 8 weeks old on monday. She naps a lot during the day for anywhere from a few minutes to sometimes 3 or 4 hour stretches. i feel like she would keep sleeping too, but i wake her up to eat. she also sleeps for 5-6 hours at night, wakes up to eat and then sleeps again for another 3-4 hours. I try to entertain her and do tummy time (which she hates) when shes awake. Sometimes she'll stay awake for a couple hours, sometimes not. I'm not sure if its normal or if i should be concerned....what do you all think?