みんあさん、こんにちは・おはようございます・こんばんは! I’ll try to keep this brief.
I’ve been having a hard time fitting WaniKani into my schedule. It might be because of the way I study: I write down every radical, kanji, and vocab that I come across on WK, unless I already know it well. That means finding the meaning of the word, finding it’s onyomi/kunyomi reading, looking up the stroke order for kanji, etc. This ideally shouldn’t take more than 15 minutes for every 10 words I learn, but sometimes it can stretch out to 30 or 45 minutes.
It may be easier to just do WaniKani without writing down EVERYTHING, but I’ve noticed that I don’t remember the words as well. I had a really hard time on level 5 trying to remember kanji because I wouldn’t write them down until days or weeks after I first encountered them.
TL;DR: What’s an effective way to retain WK vocab while not spending too much time writing down entries? Is this something that you all do as well? たすけてをください! 
I think of my reviews as the test, and Self-Study helps me prepare. I use it to pre-study when I learn new kanji so I don’t fail half of them on the first (or 4th) review. I use it to fix leeches when I have have the time and energy. I use it to review only verbs when I can’t remember that other reading.