That question has been asked on the FFF website as recently as this morning, with no comment by FFF.  Fansubs hate* to be asked the "when" question.  The answer depends on the people involved, so often no one can say.

Commie just issued an ep 11 of a certain series 2 months after their ep 10.  Oyatsu-Subs just issued an ep 12 of a series 11 months after their ep 11.  I forget how many months it took Underwater to get out the last eps of Zombie and Nichijou.  And I can think of worse examples, maybe up to 2.5 years for a last ep once from a certain group, now gone.  So watch FFF for an encore later or wait?  Up to you.

(*hate: I don't mean intellectual hate.  I mean emotional hate.)

It's not so much of a case of laziness I think, but more onto the fact that they subbed too much show and ended up not managing to complete everything. For instance, their release of Kyoukai no Rinne still stucked at the 5th episode and their Yahari S2, delayed at episode 4 as far as I had noticed and then, Nanoha Vivid had never made it out to the 3rd episode. A lot of people said that fansub is dying for some reason, and seeing that UTW only put up with Fate, Elysium has gone since 2010, m.3.3.w disappeared in 2012 or 2013, Kantai still hasn't released the 11th episode of Plastic Memories and not to mentioned that Caffeine is delaying a lot of series following the death of their original Kaylith group, I really fear for the worst.

"laziness" is a troll concept.  I wouldn't be a farmer or a fansubber with my spare time, but I'm glad some want to.  (Yeah!  Free time -I'm gonna typeset and time till bedtime!  Maybe proofread after breakfast!)