Is it OK to bike for 2 hours?

Excuse me, I'm curious about the fitness aspect of cycling. I've been thinking about taking up biking as a hobby and I'm wondering if it's SAFE or advisable to bike for two hours straight. Could you please elaborate on the potential benefits and drawbacks of such a long biking session? Additionally, are there any precautions I should take to ensure my safety and well-being during such an extended ride? Thank you for your time and consideration.