Great !! good luck ... your case processed pretty quick.. did you attach any documents with application and did you had travel during the 4 yr period ?
Looking at other threads of Sept - Oct applicants, for straight forward cases i think people who applied in January will start getting dates for tests around May - June and hopefully oath by July.
Its very good to see case getting processed so quick . Did you attach any cover letter explaining your trips ? Also since you took 4 months off , you showed as un-employed during the period ?