Washington would like the changes to occur within a year or less.

This can occur either within a word or between words.

This seems likely to occur within the next several weeks, officials said.

This should occur within 2 to 15 minutes in most cases.

Most cases occur within 6 months of taking this drug.

He knew that it must have occurred within the past few minutes.

Four occurred within the space of less than three weeks in April 1992.

This occurs within a few minutes to hours of getting the shot.

Or they can come on suddenly, occurring within minutes to hours.

Scientists said the death almost certainly occurred within the last year and a half.