In addition, he also admitted to losing $2.5 million, "in a six-hour period", while playing blackjack.

At the end of the six-hour period, all snow is cleared from the measuring surface.

As a group, all eighty-four cases developed symptoms within a six-hour period, suggesting that they all were exposed at the same time.

All 219 other passengers and crew aboard the plane were released gradually over a six-hour period before the hijackers gave themselves up to the police.

For a six-hour period on 4 June seismic activity increased to an average of 230 earthquakes per hour, at depths of 1-4 km.

A precise amount of salt had to be added to keep the body's electrolytes in balance over the six-hour period.

One study found temporary lung impairment in young men exercising while breathing as little as 0.08 parts per million of ozone over a six-hour period.

"More likely than not, they would have been alive in a three- to six-hour period," Dr. Wecht said.

Ivan had the world record of 33 (32 consecutive) six-hour periods with an intensity at or above Category 4 strength.

It uses an approximation of the energy used by a tropical system over its lifetime and is calculated every six-hour period.