neroden
Model S Owner and Frustrated Tesla Fan
In my experience as companies get bigger they are expected to have financial processes in place that allow them to close their books in less than 5 or 6 weeks. I am assuming that the shortening of the period in Q3 to less than 4 weeks was something that Jason Wheeler put in place and that it will be repeated in future quarters. If so we can expect earnings in the last week of January.
BUT on the other hand, integration of SolarCity may delay the earnings report. I've found that the immediate post-merger earnings reports are often delayed because of the complexity of integrating accounting systems and ironing out the problems with that. So we might not see earnings until, say, the last week of Feburary.
(That said I think we'll probably see them within 4 weeks for later quarters; this would be a one-off thing)