It might take a man a lifetime to find the right one.

It took me a lifetime to discover who he was.

It might take a lifetime to answer that question to my own satisfaction.

So many words written; it would take a lifetime to read them.

And a boat search would take a lifetime too long in those parts.

These can be simple to learn, but take a lifetime to master fully.

It takes a lifetime to grow the right kind of chief executive.

The answer, we know is simple but takes a lifetime to truly understand.

It took a lifetime to train one's attention to the degree needed.

To learn the contents of this house would have taken a lifetime.