How long does baby do tummy time?

I read yesterday that at 3 months, babies should spend about 80 minutes a day doing tummy time. My daughter definitely doesn't spend that much time on her belly, even spread out throughout the day. How long is your baby doing tummy time throughout the day? And if you're one of the hour+ people... Any tips for getting baby to stay on his/her belly for longer? My baby likes looking in the mirror. ☺️

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