Does it take less time to level up after 40?

It is faster for most, but not all levels after 40.

What is a fast level?

In order to level up in Wanikani, you must guru at least 90% of the kanji for that level. In order to unlock a kanji, you must reach its level and guru all the radicals it depends on. This means that for most levels, you must go through two stages: First guru all the radicals on that level, then guru the kanji on that level that you unlocked after guru’ing those radicals.

However, if at most 10% of the kanji on a level depend on radicals from the same level, then there is only one stage required to complete the level. This is because 90+% of the kanji are available immediately on level up, so you do not have to wait to guru that level’s radicals first before you can start on the kanji.

Which levels are fast levels and which are slow changes occasionally as Wanikani adds, removes, or changes content. For example, last October, level 41 changed from fast to slow, and at some point a couple months ago, it changed back to fast, leaving guides on the forum out of date. Therefore, I decided to create a script that will automatically calculate the current list of fast levels for you.

As of this writing, the fast levels on Wanikani are: 41, 43, 44, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, and 60.

To see the up to date list of fast levels, go here:
https://storyyeller.github.io/wkbuddy/fast_levels.html

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