Less than 1 hour per year for routine on-site maintenance. The main periodic task is refilling the reagents (capacity: up to 1,000 measurements — approximately 18 days at maximum frequency) and consumables (rinsing water, washing solution). Cleaning, re-calibration, and self-diagnostics run automatically. VWMS offers remote support and check, and its service partners around the globe are available for planned service visits and checks.