Usually a level at maximum speed takes upto 6 to 7 days.
If you want to increase your pace you could do review’s at morning and evening to speed up the process.
But reaching level 60 at wanikani doesn’t mean you are good at japanese.
It is greatly encouraged to do other resources and you can also do Immersion if you want to improve fast and reinforce your kanji and vocabulary from wanikani.
But, in the end you should learn the language according to your end goal.
And have much fun as possible while doing it.
You should read this thread by jprsperiera, It gives an insight on the topic you are worried about.
Love the process not the goal.