Ah, well. This depends on a lot of things:
- How much time you have to spend on WaniKani per day
- How accurate you’ll be during reviews
- How much your own brain can handle at once
It’s certainly possible to just do all of your lessons at once. There are several users here who do so. However, doing this kind of requires you to have really high accuracy on your reviews. Once you get a bunch of items wrong, you see that many reviews pop up that much more often and it’s easy to get burned out (+500 reviews per day once you’re burning turtles, too).
There are also people who aren’t in a hurry at all or don’t feel like they have the capacity to remember everything at once. These people tend to recommend about 20 lessons a day or capping your Apprentice and Guru items at a certain limit. If this is how you want to go, it’s worth considering the lifetime subscription. Then you can take all the breaks you need if you end up going faster than you can handle.
It’s best to just test out for yourself what you’re comfortable with. 5 radicals per day is pretty slow. If you feel like you can handle more, then go for it.