PLEASURE DUTY DEFINITION Highly intermittent operation with very large variations in engine speed and power Average engine operating hours limit: 500 hours/year 300 hours/year for mechanical gearboxes Typical hull forms: Planing. Typical applications: Private, non-commercial, non-charter sport/leisure activities. LIGHT DUTY DEFINITION Intermittent operation with large variations in engine speed and power Average engine operating hours limit: 2500 hours/year (for hydraulic transmissions smaller than ZF 2000 series, 2000 hours/year). Typical hull forms: Planing and semi-displacement. Typical applications: Private and charter, sport/leisure activities, naval and police activities. MEDIUM DUTY DEFINITION Intermittent operation with some variations in engine speed and power Average engine operating hours limit: 4000 hours/year. (for hydraulic transmissions smaller than ZF 2000 series and workboat ZF W2700 series, 3500 hours/year) Typical hull forms: Semi-displacement and displacement Typical applications: Charter and commercial craft (example: crew boats), and naval and police activities CONTINUOUS DUTY DEFINITION Continuous operation with little or no variations in engine speed and power Average engine operating hours limit: Unlimited Typical hull forms: Displacement. Typical applications: Heavy duty commercial vessels.