Why is the X-Bike class 30 minutes instead of the usual 45 minutes with traditional indoor cycling (Spinning)?

FASTER – Part of the three word X-Biking tagline… FITTER. FUNNER. FASTER. The average rider will burn about 500 calories riding any of the 30-minute interval based X-Biking classes. It can take up to twice as long to reach the same goal riding traditional fixed-bar, fixed-gear, indoor bikes. Plus, the pre-programmed X-Biking classes with custom music tracks designed for each of the unique ride profiles free your X-Biking instructor to focus entirely on your needs as a rider rather than writing the workouts or being a killer DJ.