Final answer:
The question does not specify which Davis Cup team or individual is being referred to, hence an accurate answer cannot be provided. The tenure of a Davis Cup captain can vary on several factors including national association policies and team success.
Step-by-step explanation:
The duration for which someone was captain of the Davis Cup team is not specified in the question, making it impossible to provide a factually accurate answer. The Davis Cup is a prestigious international team event in men's tennis. The position of team captain is an important role, as the captain is responsible for team selection, strategy, and leadership during the competition.
The tenure of a Davis Cup captain can vary from country to country and is determined by the national tennis association involved. Some captains serve for a few years, while others may serve for longer periods, depending on the success of the team and the association's policies.