diff --git a/.github/workflows/historical-adsb.yaml b/.github/workflows/historical-adsb.yaml
index 6e59f4b..d96b0bc 100644
--- a/.github/workflows/historical-adsb.yaml
+++ b/.github/workflows/historical-adsb.yaml
@@ -12,10 +12,10 @@ on:
         required: true
         type: string
       chunk_days:
-        description: 'Days per job chunk (default: 7)'
+        description: 'Days per job chunk (default: 1)'
         required: false
         type: number
-        default: 7
+        default: 1
 
 jobs:
   generate-matrix:
diff --git a/src/adsb/historical_generate_matrix.py b/src/adsb/historical_generate_matrix.py
index cd11789..ef28e4f 100644
--- a/src/adsb/historical_generate_matrix.py
+++ b/src/adsb/historical_generate_matrix.py
@@ -41,7 +41,7 @@ def main() -> None:
     """Main entry point for GitHub Actions."""
     start_date = os.environ.get("INPUT_START_DATE")
     end_date = os.environ.get("INPUT_END_DATE")
-    chunk_days = int(os.environ.get("INPUT_CHUNK_DAYS", "7"))
+    chunk_days = int(os.environ.get("INPUT_CHUNK_DAYS", "1"))
     
     if not start_date or not end_date:
         print("ERROR: INPUT_START_DATE and INPUT_END_DATE must be set", file=sys.stderr)