diff --git a/logbook/views/dashboard.py b/logbook/views/dashboard.py
index be3f36c..112a78c 100644
--- a/logbook/views/dashboard.py
+++ b/logbook/views/dashboard.py
@@ -24,7 +24,7 @@ def totals_per_function(log_entries: QuerySet[LogEntry]):
 
         now = datetime.now(tz=UTC)
         periods = {
-            "3M": timedelta(days=90),
+            "1M": timedelta(days=30),
             "6M": timedelta(days=180),
             "1Y": timedelta(days=365),
             "2Y": timedelta(days=365 * 2),