Can I wear an aero race jersey for long endurance rides?

You can, but it's not ideal. The compressive fit can cause fatigue and restricted breathing on rides over 3-4 hours, especially in hot conditions. The limited pocket space makes carrying food, tools, and extra layers challenging. Many riders find the tight fit uncomfortable during café stops and slow sections. If you do use an aero jersey for endurance rides, consider sizing up slightly for comfort, and be aware that you're sacrificing some aero benefit for that comfort. An endurance-fit jersey is a better choice for rides over 4 hours.