The Kyoto trading period only applies for five years between 2008 and 2012.

Anyone with half a brain can pass a degree on almost any subject if they apply themselves for 3-4 years to study that topic.

The technology in its present form had been applied for less than three years.

We've known how to apply it, in principle, for many years.

However, his method became widely applied for many years in mental institutions worldwide.

This new education and training system was applied for two academic years.

This method was applied for more than 200 years.

I also appreciate that the rules now being proposed are temporary and will apply for only three years.

Taxpayers must elect which base to use, and such election applies for five years.

The nil rate came into force on 6 April 2010 and applies for five years.