Cutting lessons short

[finnra]

[Userscript] WaniKani Lesson Filter

This is a third-party script/app and is not created by the WaniKani team. By using this, you understand that it can stop working at any time or be discontinued indefinitely. What is it? This script lets you specify the number of lessons of each type you want to do in a given session, while maintaining WaniKani’s intended lesson order. This means that if you use this script with the Ascending level then subject setting, you will get the radicals, kanji, and vocab that WaniKani wants …

This script probably does what you want.