Of course! There is no right or wrong way to pray the Rosary when speaking about the volume. It's good to pray the Rosary out loud with people, alone, by yourself, quietly, silently, at a church during Adoration, while nursing a baby, giving a child a bath, waking up in the morning, falling asleep to it, doing only one decade at a time. Yes, it's nice to pray it all at once. But if you are spending any moment you have praying, God knows your heart and loves that you are doing it!