michael_nielsen

that rule of thumb originates with @gwern [https://www.gwern.net/Spaced-repetition#how-much-to-add …] by the way

I think I got it from http://SuperMemo.com .

It's pretty likely I got it from SuperMemo. Ironically, I don't remember. But then, I didn't put the source in Anki...

Incidentally, a few months ago I checked the rule of thumb, based on my average card review time, frequency of correctness statistics, and Anki's spacing algorithm. It came out to around 2-3 mins for an average card, based on reasonable multi-year extrapolations.

How consistent are you? Say over the past 3 months, how many days did you miss? Any advice on that? Because sometimes I miss out a day or two, and when I get back to it, many cards feel a little "out of touch"

I miss ~10% of days. Mostly on days before big exams where I can't muster up the mental energy to do studying + Anki. Or day of exam if I'm too tired. Results in catch-up the next day but not too disruptive

Since 2009, I've missed 837 days or about 26%.

582 out of 802 days, or 28% missed (much like @gwern). Most of these came over a period of a few months when I was often only studying 1-3 days a week. Otherwise, I seem to usually study 6 or 7 days a week. Having a habit - I do it when I walk to morning coffee - helps a lot.