Many people who level up in 6-10 days use a reorder script. The purpose of this is to allow you to learn all of your radicals and kanji as soon as you level up, rather than needing to wait until you’ve finished the vocab lessons from the previous level. I have done a few levels in 7-8 days using reorder scripts, but as others have mentioned, you will have many reviews to do a day if you do this long term, and you will need to set more time aside on days you level up in order to complete your radical and kanji lessons as soon as possible.
If you’re still confused, I would recommend this guide to get a better understanding of how the Wanikani SRS system actually works. After that, it will start to make more sense. It’s a bit of a long read, but it’s well worth your time if you plan on doing Wanikani for a long time