diff --git a/obsidian_import/__init__.py b/obsidian_import/__init__.py
index 6ee0e0c..cb3a39f 100644
--- a/obsidian_import/__init__.py
+++ b/obsidian_import/__init__.py
@@ -187,13 +187,15 @@ class EventContent:
     comment: str
 
 
-def import_activity_sample_csv(
+def import_activity_samples(
     vault: ObsidianVault,
-    rows: Rows,
+    raw_samples: list[ActivitySample],
     content_mapper,
     group_category: str | None = None,
+    default_estimated_duration: datetime.timedelta | None = None,
 ) -> int:
-    samples = heuristically_realize_samples(list(iterate_samples_from_rows(rows)))
+    samples = heuristically_realize_samples(raw_samples,
+                                            default_estimated_duration=default_estimated_duration)
 
     if group_category is not None:
         samples = merge_adjacent_samples(list(samples), group_category)
@@ -208,7 +210,6 @@ def import_activity_sample_csv(
         samples_per_date.setdefault(date, [])
         samples_per_date[date].append(sample)
         del date, sample
-    del rows
 
     def map_to_event(sample: RealizedActivitySample) -> Event:
         content = content_mapper(sample)
@@ -232,6 +233,15 @@ def import_activity_sample_csv(
 
     return num_updated
 
+def import_activity_sample_csv(
+    vault: ObsidianVault,
+    rows: Rows,
+    content_mapper,
+    group_category: str | None = None,
+) -> int:
+    raw_samples = list(iterate_samples_from_rows(rows))
+    return import_activity_samples(vault, raw_samples, content_mapper, group_category)
+
 
 def map_watched_series_content(sample: RealizedActivitySample) -> EventContent:
     subject = sample.single_label_with_category('series.name')
@@ -257,8 +267,31 @@ def map_games_played_content(sample: RealizedActivitySample) -> EventContent:
     )
 
 
+def import_wanikani_events(vault: ObsidianVault, rows: Rows):
+    keys = ['unlocked_at', 'started_at', 'passed_at', 'burned_at']
+    raw_samples = []
+    for row in rows:
+        for k in keys:
+            if k in row:
+                raw_samples.append(ActivitySample([Label('application.name', 'WaniKani')], None, row[k]))
+            del k
+        del row
+
+    def mapper(sample: RealizedActivitySample) -> EventContent:
+        subject = sample.single_label_with_category('application.name')
+        return EventContent(
+            verb='Practiced',
+            subject=subject,
+            comment='',
+        )
+
+    return import_activity_samples(vault, raw_samples, mapper,
+                                   group_category='application.name',
+                                   default_estimated_duration=datetime.timedelta(minutes=5))
+
 PATH_WATCHED = Path('output/show_episodes_watched.csv')
 PATH_PLAYED = Path('output/games_played.csv')
+PATH_WANIKANI = Path('output/wanikani_lessons.csv')
 PATH_WORKOUT = Path('/home/jmaa/Notes/workout.csv')
 PATH_STEP_COUNTS = Path(
     '/home/jmaa/Notes/Rawbackupdata/Steps/exportStepCount_2025-03-15_22-58-20',
@@ -267,6 +300,7 @@ PATH_STEPMANIA = Path('output/stepmania.csv')
 
 
 IMPORTERS = [
+    {'path': PATH_WANIKANI, 'standard_variant': True, 'import_rows': import_wanikani_events},
     {'path': PATH_WORKOUT, 'standard_variant': True, 'import_rows': import_workout_csv},
     {'path': PATH_STEP_COUNTS, 'import_rows': import_step_counts_csv},
     {
diff --git a/personal_data/activity.py b/personal_data/activity.py
index ba6d305..aed2a29 100644
--- a/personal_data/activity.py
+++ b/personal_data/activity.py
@@ -47,6 +47,7 @@ class RealizedActivitySample(ActivitySample):
 
 def heuristically_realize_samples(
     samples: list[ActivitySample],
+    default_estimated_duration: datetime.timedelta = DEFAULT_ESTIMATED_DURATION,
 ) -> Iterator[RealizedActivitySample]:
     """Secret sauce.
 
@@ -72,7 +73,7 @@ def heuristically_realize_samples(
 
         start_at = sample.start_at
         if start_at is None:
-            estimated_duration: datetime.timedelta = DEFAULT_ESTIMATED_DURATION
+            estimated_duration: datetime.timedelta = default_estimated_duration
             start_at = max(previous_sample_end, end_at - estimated_duration)
             del estimated_duration