Examples:

• Although it may have been interesting to check if the passengers who supposedly would arrive at 16:30 would go back forty five minutes later terrified at the sight of the deserted panorama.
• Our scientific strength and experience is based on research activity going back forty years.
• When we are close to achieving abolition of internal frontier controls on persons in the European Union, that clearly should not become a reason for eliminating the acquis of the Nordic Union, which dates back forty years.