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The Real output y is obtained by dividing the current amount in a material stocku_level by the (positive) rate of its outflow u_rate. According to Little's Law—a famous result from queueing theory—the output y will be equal to the mean time of residence in the stock if the system is in equilibrium.
u_level) and the rate of outflow (u_rate) have to be positive; negative values will be assumed to be zero.durationAtZeroRate (default = Constants.inf will be used to obtain the output.Additional information can be found on Jim Hines' Molecules of Structure website: →Residence Time.
rateOfDepletion to Unspecified in v2.2.