For those too lazy to study japanese
okay,looking at TLWiki and how they update like,once in a never:
December 14, 2012 - Yukiho's route translated
August 20, 2012 - Chihaya's route translated
August 19, 2012 - Iori's route translated
November 11, 2011 - Yayoi's route translated
November 11, 2011 - Makoto's route translated
August 11, 2011 - Haruka's route translated
Makoto and Yayoi's route were translated in 70-90 days or so. Then nothing happened for 9 months, and then another 2 routes were finished. Then 4 months and then Yukiho's route came out
Assuming we can see the pattern here, In about 2 to 4 more months we can see Ami and Mami,or Azusa and Ritsuko.