Mmm, somebody did some modelling a while back and while “3 carefully spaced review sessions a day” is necessary for maximum speed, doing 2 a day like that still gets you quite a lot of the speed improvement compared to a single session. It ought also to improve accuracy by having the first review effectively come up at more like 12 hours than 24, though accuracy doesn’t seem to be an issue here.
The “do all reviews and lessons immediately they appear” and “one session a day” graphs are in this post – on the theoretical optimum you get to level 60 in less than year, and at one session a day you’re only part way through level 37. The three sessions a day graph is in this post and is slightly slower than the maximum but still gets you to level 50 in a year. Finally, the twice a day graph is the one in this post and it gets you to level 49 in a year, so it’s almost as good as doing three.
(In all these graphs the assumption is that you do everything available at the time when you have your review and lesson schedule and that you get 100% accuracy, which of course you won’t achieve; in the real world three sessions a day is likely to improve accuracy a bit and also to reduce the amount of time a mistake adds to things.)
Incidentally I would suggest that even if you “only” got to level 37 in a year your kanji ability would probably be well ahead of your other skills unless you were doing a significant amount of other study on top of WK.