The waiting time statistics of halo coronal mass ejection events was studied. The data set in the publication “A new method for estimating widths, velocities and source location of halo CMEs (G. Michalek, N. Gopalswamy, and S. Yashiro, ApJ, 2002 preprint doi: 10.1086/345526)” was used. I found that the highest frequency of occurrence of halo CME waiting time is at 10 hours. This corresponds to 5 degree of solar rotation. This means the solar magnetic lines may get twisted up in a few hours. Exponent decay of the tail of the time distribution may mean some kind of differential equation mechanism for long waiting time in analogy to Beer’s law in laser light propagation in absorptive materials. (supervised by Drs. Tak David Cheung and Donald E. Cotten, CUNY)