It's a great question to ask when considering a cycling routine! The answer, however, depends on several factors such as your fitness level, goals, and available time. Are you looking to maintain general health, lose weight, or train for a cycling event? Each of these scenarios would require a different approach. Additionally, consider your current fitness level and how much time you can dedicate to cycling daily. A general recommendation for maintaining health might be around 20-30 minutes of moderate cycling, which could translate to a few miles depending on your pace. But ultimately, the key is to find a routine that works for you and gradually increase the distance and intensity as you progress. What are your specific goals and constraints when it comes to biking daily?