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The eighth-century controversy that set the Latin and Greek Orthodox Christians apart was over
Basic Rest-activity Cycle
A circadian rhythm concept suggesting that individuals have intrinsic cycles of rest and activity, notably proposed by sleep researcher Nathaniel Kleitman.
1 Hour
A measure of time equivalent to 60 minutes or 3,600 seconds.
1.5 Hours
A measure of time equivalent to ninety minutes.
3.5 Hours
A period of time equal to three and a half hours or 210 minutes.
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