I have seen some evidence that suggests phone calls terminate after about one hour. This would make sense as a check on hung downloads. Since the initial ReplayZone downloads can be extensive and a software download takes between 30 and 90 minutes (my first 3.0 took about 35 minutes), it might take several calls to get everything.
Thus, if you rely on the nightly calls it might take a few days. If you force calls, you will probably get it all after 2 or 3 tries depending on how good your connection is.