"What we need is to change the way the French think, but that will take a generation."

And that's the kind of thing that takes a generation to figure out.

They believed it would take at least a generation or two.

That would take generations, if it ever happened at all.

What used to take a generation is now down to a couple of years.

It will take a generation, maybe longer, to pull down those walls.

It often took a generation or two for new ideas to settle in.

In other countries this sort of change would take a generation.

"To make peace takes generations, a deep movement and a change of the spirit."

Unfortunately, it will take at least a generation for any significant change to occur.