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An oxygen rebreather diver or a fully closed circuit rebreather diver consumes about 1 litre of oxygen corrected to atmospheric pressure per minute. Except during ascent or descent, the fully closed circuit rebreather that is operating correctly uses very little or no diluent. A diver with a 3-litre oxygen cylinder filled to 200 bar who leaves 25% in reserve will be able to do a 450-minute = 7.5 hour dive (75% × 3 litres × 200 bar × 1 litre per minute = 450 minutes). This endurance is independent of depth. The life of the soda lime scrubber is likely to be less than this and so will be the limiting factor of the dive.[citation needed]