We don't follow a schedule, but we DO have a routine. At the beginning of the year I was feeling like we didn't cover everything I wanted to get done, so I made a list of all the subjects I wanted to cover each week and divided them up by the day. For instance on Mondays we do Dictation/Copywork, followed by Spelling/Phonics, Math, Writing/Grammar, History, and then Music. Tuesdays we start with Latin, then Spelling/Phonics, Math, Writing/Grammar, History, and Science, etc. We take breaks in between subjects, run out and do errands, etc, but I don't schedule a set amount of time or a particular time of day to do these subjects, I just know we will do them in that order. This has helped me tremendously, because now I know I'm not missing anything and our days have a predictable structure.
HTH!