I'm about halfway through level 8 of WaniKani now, 3 months in.
Since the person who made the WK mobile device also made a related
stats thingy, here's a visual representation of my progress, complete with estimates of how long it should take me to reach various milestones:

To which I say, you can really tell I've gotten a lot more careful about double-checking for typoes in the past few levels.
I'll put WK on vacation mode while I'm in NYC. I could keep it on, and do my reviews over wifi in the evenings, but... nah.
(The stats tool also shows you how much progress you're making in comparison to school grades in Japan, JLPT levels and commonly-used Kanji in newspapers. Level 8 completion in WK means -- in theory -- you know all the Kanji you'd need for JLPT N5, though obviously none of the grammar etc. And it means that you know a decent proportion (though not all) of the kanji you'd know by year 2 in Japanese elementary school. I find this pretty heartening, personally.)
...also I am regularly getting new kanji in the reviews which I already know at least one reading for because they're in an actor's name and I've trained myself to spot them. Useful side-effect or embarrassing fangirlishness, I can't decide, but hey.