I used skritter a couple of years ago to learn kanji with the RTK method. It was very effective, but I ran into a problem I have had with other soaced repetition systems: the reviews became too many.
I find I’ll go through a weird inflection point. Things will be easy, easy, easy, a bit harder, overwhelming. Clearly, my intuition for how fast I can go is not good.
I’m learning another language right now, but thought I would restart the Kanji again, at a more leisurely pace. The trouble is picking that pace.
Is ten characters a day likely to be sustainable, or will it become excessive within 1-3 months?
Note: the issue is that by the time the review load becomes excessive, it is already too late. By then it is no longer the new characters which require effort: it is the accumulated mass of reviews.