User blog comment:Omega natsu2/Chapter 368: The Third Seal, Predictions./@comment-1359322-20140122154853/@comment-7418318-20140122155157

There's no way to tell. Prologues are some times shorter than regular chapters and some times not, so we can't assume that the "Tartarus Parts" are going to be the same length as the "Tartarus Prologue".