I actually put quite a bit of time into Japanese each day, though WK is only a relatively small portion of that. I think I spend a little over an hour on SRS each day (split between WaniKani, Kaniwani, and Anki), and often well over an hour or two on textbook study, writing practice, and reading, plus a lot of hours of passive immersion (watching unsubtitled Japanese media, reading tweets on twitter, etc.) that I donāt count as study time 
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Itās hard to measure progress toward fluency, but Iām about a third of the way through the Minna no Nihongo beginner series and am on track to complete it around when I complete WK, which should be in a year and a half or so (Iām taking about 12-14 days per level). Once I reach an intermediate level, I suspect that Iāll be able to progress a lot faster because reading will become substantially easier (and thanks to WK, kanji wonāt be a bottleneck), so Iām hoping this puts me on track to become decently proficient at the language within the next 4-5 years.
I should mention, though, that I am not practicing speaking at all because it isnāt a priority for me. My goal with learning the language is reading and auditory comprehension, not using it to communicate with other people. So even if I reach an advanced reading/listening level, my ability to produce the language will probably lag behind quite a bit.
My goal is to complete WK moderately fast (2.5 years total), but not so fast that Iām neglecting other areas of study, hence my slower pace. I never want SRS to become more than half of the time I spend studying each day. But I will be glad to be done with WK eventually, because thatāll allow me to add more words to Anki instead (which will make reading easier, which will increase the amount of content input I get each day, whichāll help me become fluent faster, etcā¦).
Iām not sure that this is really typical, though . I should mention that studying Japanese is one of my main hobbies right now (and my other main hobby is watching Japanese pro wrestling, which combines extremely well with language learning), so studying is quite literally what I do for fun in my spare time. Spending multiple hours a day studying is fun for me instead of being mentally draining.
And the reverse of seeing something in the wild and then it pops up on WK.
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