A method of and an apparatus for determining real-time data latency are disclosed. 1% by weight to 20% by weight, based on the total amount of monomers, wherein at least 10% by weight of the total amount of water are added to the reaction vessel only after the monomers have been added to the reaction vessel and the conversion is at least 40%, based on 100% of the monomers. The data is thus checked to see if the original data is error. It is determined whether the throttling factor exceeds a threshold.