Some yachts are used exclusively by their private owners, others are operated all year round for charter businesses, and a large number are privately owned but available for charter part time. The weekly charter rate of luxury yachts around the world ranges from a high of 700.000 EUR per week to the law 20,000 EURO/week. Expenses of approximately 25-30%, such as food, fuel, and berth age are charged as an extra, as well as a customary crew gratuity for good service. Large and super luxury yachts require a crew complement to operate and run the yachts. The crew can number from 8 members for a 120ft yacht, to a complement of 70 crew members for a yacht the size of M/Y Eclipse.