3/D question

Hi mamas I made an appointment with a 3/D 4/D ultrasound place here for fun (non diagnostic) and the lady who will be doing it said they will be looking at baby for about an hour to see the face and all the features. Is an hour too long? Will this hurt my little girl? I've heard that ultrasounds should be no longer than 30 min but wanted to hear your opinions.

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