don't have to follow the guidelines strictly, as the name suggest they're just guidelines. sometimes bb may require more milk sometimes less. bb will let you know accordingly. my bb latch directly and sleep from 10/11+pm till 6+am. during the day she drinks every 3hr or so, sometimes she can even drag till 4+hr or as short as 2hr. I feed her on demand since birth till now. she 9 weeks old currently and have been gaining 1kg per month since birth.
take cues from your lo. don't worry about the miss feeds, as long as your lo is sleeping and playing with you well, everything will be okay