Abstract
Penrose (2003) states that the number of points in the largest cluster of a percolating Poisson process restricted to a large finite box is asymptotically normal. In this note, we establish a rate of convergence for the statement. As the largest cluster exhibits long-range dependence, we use the fact that the second largest cluster has comparatively shorter range of dependence to restrict the range of dependence, apply Corollary 3.2 of Chen, R\"ollin and Xia (2021) to obtain a Berry-Esseen type bound for the normal approximation of the number of points belonging to clusters that have a restricted range of dependence, and then estimate the gap between this quantity and the number of points in the largest cluster.

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