Unless you're required to clock in/out, or you -never- have meetings away from your desk, no one notices. It's only if you have issues delivering that a manager

Unless you're required to clock in/out, or you -never- have meetings away from your desk, no one notices. It's only if you have issues delivering that a manager is going to start paying attention to when you're not at your desk and notice you're gone longer than an hour.