In what some may see as a criticism of Blues owner Roman Abramovich, Benitez says United have benefitted from a stable environment.
"United have the same manager for years and 80 per cent of the squad is the same," said Benitez.
"Chelsea are changing because they have brought in some good players but they still need to settle down and they have to be consistent.
"That is the one thing that you will have when you know the league, the referees and the rivals and your team-mates. So it is a question of time."
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