Forgetting to bathe, eat, sleep or interact with the outside world = probably too many
Forgotten what WK does and why you signed up = probably not enough
Without being facetious: don’t think there is a right answer. Depends on how quickly you want or need to learn, how easily you learn and most importantly how much free time you have to study Japanese (and how much of that you want to devote to learning via WK rather than doing grammar, listening practice, speaking practice or reading).
I do the Radicals and Kanji the moment they are available and usually some vocab to go with them.
I generally add the rest of the vocab over the course of the week or so that i take on each level.
As long as you stay on top of the reviews its all durable, however if you let things slip it can be a living nightmare to clear the back log.
Dont let things slip if you can help it 
I do all of my lessons as soon as they come up (unless I don’t have time to finish them). I’d rather get everything into a queue and worry about learning it later rather than have a bunch of lessons piling up on me.
Also, I’m always trying to get to the vocabulary as soon as possible. Vocabulary helps me remember the various readings for kanji, so learning individual kanji can sometimes be a pain until I’ve seen it in a vocab word a few times. Sometimes I wish I could just skip radicals, learn vocab, and then learn kanji lol.
That’s if you have 100% accuracy. In practice it’s always more. For instance, I have about 90% accuracy across the levels (a bit less in A1), and that gives me 10.15 reviews per lesson. The difference might not seem big, but multiplied by your lesson rate, that can end up being many more minutes per day.
Source: Choosing the right pace for your lessons (thanks to queueing theory) - #34 by Tenoch
I’m at about the same point in my WaniKani experience and try to do all lessons as they become available. Whenever I can’t manage to learn something on the first try the SRS swoops in and makes me learn it by not reducing the review frequency for that item. Keep in mind that a lot of things at these levels are repetitive so the learning load isn’t the same for all sets of 5 lessons. Sometimes you get the same counter with four different number examples and can learn them without much effort while other times you get completely unrelated kanji.
IMO as long as you do the lessons the SRS will do the rest.
I’m doing WK with 8 days/level and i get about 100 reviews in the morning and the evening. Somtimes it’s more, somtimes less. I have an accuracy of 90% and I’m absolute fine with this.
By the way, does anyone know a userscript, that limits review size? Sometimes I’ve only got time for 20 or 50 reviews, but I have to take the whole stack. This results in many items that I answered “half” (e.g. only meaning), which costs extra time 
~T 
No userscript needed. There’s a button during reviews called the wrap up button that will finish the session after 10 more reviews. This also makes sure to finish the half-finished items from that session.
OMG, Thank you! I always wondered what this button is used for, but of course only once clicking it does nothing 
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