Stat time:
Bla left:
November 17, 2012
then, Naru left:
March 06, 2013
that's 80 days later. so the next leave will be in:
May 20, 2013
BUT we have to factor in the back time:
Bla was back:
December 27, 2012
That's 40 days, so Naru will be back
April 15, 2013.
BUT those are just trends, no hoping.