For scientific reasons unknown to Farnsworth and his staff, the necessary reactions lasted no longer than thirty seconds.

Whether that reaction lasts is likely to depend on the course of war news.

However, in some cases the local reaction can last for up to two years.

These mild reactions are common and may last from a few hours to a few days.

The reaction would only last an instant, Patton knew.

The reaction usually begins 36 to 48 hours later and can last weeks.

Congress officials say they expect a sympathy vote to carry them to victory, but are uneasy about how long this initial reaction will last.

This reaction usually lasts 48 to 96 hours.

The reactions can last for several hours or days.

Whether that reaction can last is likely to depend largely on the course of war news from Iraq.