I don't have any work or school obligations right now, so I'm free to spend as many hours on Japanese as I need to, which vocabulary-wise usually amounts to about a solid 75 minutes/day in Anki clocked time. However, time spent repping is sometimes twice or even three times that amount since I need to take frequent breaks to keep my sanity.
Here's my own experience so far; maybe you can use it to make ballpark estimations for other scenarios:
-Adding 44 new cards/day evened out to about 470ish reps due every day.
-Since jumping up to 50/day, the reps are evening out around 550.
(That makes daily reps around 11 times the new card amount.)
-My retention rate this month for both young and mature cards is 79%
[It should be noted that I'm in the final 1,000 words of Core6k, so vocabulary is significantly easier since I can guess many of the readings on my own after being exposed to 5,000+ words already.]
To answer some of your other questions,
Quote:What is the difference between when you review for recognition and production? Is it in the cards you're using, or the way you use them, and how do you view the purposes of each method?
I only do recognition cards for vocab. There's a few reasons why.
1) I already get writing practice with my Keyword->Kanji RTK reps.
2) You don't have to grapple with synonym madness, and there are a TON of synonyms in Core6k at least
3) Reading, not writing/speaking, is my primary Japanese goal, so practicing with recognition only makes sense. I know that supposedly if you do production, recognition will be "in the bag" as well, but that hasn't been the case at all with my RTK production deck. I can go Keyword->Kanji wonderfully, but the reverse (recognition) is terribly hard for me.
I'm still a Japanese noob, but if you have any further questions, feel free to email me.

(This goes to anyone.)
Edited: 2013-08-29, 2:25 pm