Is this too long to sleep?

My 4 weeker fed about 8pm last night for half an hour then fell asleep, we went up to bed with her about half 9 expecting her to wake about 11pm but she slept until 2:30 😯 she then took another good feed and slept again until 6. We don’t set alarms as I usually hear her stirring so I was shocked when I saw she’d slept about 6 hours straight.

I’m having trouble getting her to get a good sleep during the day, she cat naps so I think she just needed a good deep sleep but I’m concerned 6 hours is a bit too long?