For sure but I can’t help thinking that people who “speedrun” WK to level 60 are making it harder on themselves for no reason. Assuming that you’re starting from scratch you’ll probably have a big deficit in terms of grammar and general comprehension if you finish WK in a year, unless you also manage to find a lot of time to complete your studies outside of WK.
So basically you end up with a very solid Kanji knowledge that you can’t really use, and by the time your grammar/vocab knowledge will have caught up you’ll almost certainly have forgotten a good chunk of the advanced kanji that you didn’t have the opportunity to encounter while consuming N5/N4 content that’s mostly “公園で妹と犬は遊びます”-tier.
Some do, but if you don’t cheat at all it can take a very long time to get there and I suspect that many people drop WK before finishing that. So you have a small minority of WK users making it all the way to 60, and a minority of this minority who burn everything, I suspect. Here’s an example: Introduction / Level 60 / Everything Burned
Remember that every time you miss a burn review it sets you back about 5 months, so if you have a couple dozen leeches it can easily take years to go from level 60 to 100% burned.