Where your German hours go, and how to get them back
A solid B2 takes 600 to 800 lessons of 45 minutes, 450 to 600 hours, and most learners spend more. Where the extra hours leak out, what the research on memory says about each leak, and what MeisterPath does about it.
Learning strategyDr. Nitin KumarOctober 20267 min read
The clock of St. Peter in Zürich, one of the largest church clock faces in Europe. Photo: Roland zh, CC BY-SA 3.0.
In How long does it take to learn German? the answer was hours. The guideline figures assume a course, homework and no long gaps. Real learners pause, repeat what they know and stop at recognition.
450–600hours to B2: the Goethe-Institut’s 600–800 lessons of 45 minutes
13 millionDuolingo practice records behind the memory model
90%recall chance when MeisterPath brings a word back
16.5%more retained with review timed per student
Where hours go
Forgetting between sessions
Practising cards you already know
Recognising words you cannot use
How to get them back
Bring each word back in several forms: cards, reading, grammar, a test
Repeat only what you missed
Train recall and use, not just recognition
Leak one: forgetting between sessions
Burr Settles and Brendan Meeder fitted a model of forgetting to about 13 million Duolingo practice records. Every word gets a half-life: the time after which your chance of recalling it has halved.
Short at first. A word met once may last a day or two.
Longer with every recall. Each return stretches the half-life.
A gap costs more than its length. After three weeks away, most of last month’s material has gone.
How much of a new word is left, day by day
Met once, never again
Brought back before it fades
Day
Days since you first met the word. Vertical axis: the chance you can still recall it. Dots mark the returns.
An illustration from the half-life model, not learner data: a new word starts with a half-life of two days, and each return makes it two and a half times longer. To keep the picture readable, a return comes here when the chance has fallen to 70 percent; MeisterPath brings a word back while it is still about 90 percent.The numbers behind the chart
Day
Met once
Brought back
1
71%
71%
3
35%
76%
7
9%
83%
14
1%
92%
30
0%
97%
Met once, the word is gone within two weeks. Brought back four times in a month, it is still at 97 percent on day 30.
The timing should be yoursIn a semester-long school study, Robert Lindsey and colleagues timed review per student and per item. Retention rose by 16.5 percent over massed study, and by 10 percent over one spaced schedule for everyone.
In MeisterPath
Every item has its own memory state. Each word and each grammar rule.
Back at about 90 percent. The FSRS scheduler returns an item while a recall is still a quick success.
Five meetings in reading. Learned words return in later stories and dialogues, with cards, drills and tests on top.
Your pace, not the calendar. The course spaces returns in units of material, as Landauer and Bjork did; once you are learning, the scheduler counts real time.
Leak two: practising what you know
Most review tools show every card, every time. Know twelve of twenty, and more than half the session confirms what you knew.
Sort every card once Don’t know, unsure, know.
Repeat only the first two A card you did not know needs two clean answers to leave; an unsure one needs one.
Spot-check the easy ones A quarter come back, and a forgotten one rejoins the rotation.
Let the gaps grow A card returns after one other card, then after four.
Move on at four in five Once four in five cards are put away, the app takes you to practice.
Why expand only within a session?Jeffrey Karpicke and Henry Roediger found that growing gaps help in the short term, but at delays of two days and more, equal spacing came out ahead. So the deck expands within one sitting, and the scheduler takes care of the days.
Leak three: recognising, not using
Picking a word from four options is the cheapest way to feel you know it. Exams ask you to produce the form, in a sentence you have never seen.
Depth
What you do
Trained this far
Recognise
Pick the word or form
Words you will rarely need
Recall
Produce it yourself
The middle of the list
Transfer
Use it somewhere new
The core vocabulary
Producing counts for more. It weighs more than recognising.
Two in a row to move up. An item climbs a depth only after two correct answers in a row.
Your weak points first
An hour on what holds you back is worth more than an hour on what already works.
A forgetting estimate for everything. Every word and rule, kept up to date.
Two or three things, named. The home screen shows what holds you back right now.
Tested the hard way. In MeisterPath Labs, synthetic learners carry weak points we planted, and we check that the app finds them.
You cannot skip the hours. You can stop losing them.
What this does not change
No shortcut to B2. Nobody gets there in fifty hours, and we do not promise it.
More of your hours count. The guideline table still stands; fewer hours leak away.
Starting values, for now. The scheduler’s numbers come from the research; we will tune them on real learners’ data once the app is open.
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