How far should you bike a day?

Hey there, I'm curious about something. I've been thinking about picking up cycling as a way to get some exercise and fresh air, but I'm not sure how much is the right amount. So, I'm wondering, how far should one bike a day? Is there a general rule of thumb, or does it depend on factors like age, fitness level, and goals? I'd love to hear your thoughts on this. Thanks in advance for your help!