Is an aero gravel bike comfortable enough for long rides?

Comfort depends on your flexibility, the specific bike's compliance features, and tire pressure. The aggressive position can cause neck, shoulder, and hand discomfort for riders lacking core strength or flexibility. However, modern aero gravel bikes incorporate compliance through seatpost design, carbon layup tuning, and tire volume. With 38-40mm tires at appropriate pressures (25-35 psi for a 70kg rider) and a compliance seatpost, most riders can comfortably complete 6-8 hour events. If you have existing back or neck issues, consider a less aggressive gravel bike.