diff --git a/src/sentry/preprod/eap/write.py b/src/sentry/preprod/eap/write.py
index 919e72562d70c7..52130184b6eab1 100644
--- a/src/sentry/preprod/eap/write.py
+++ b/src/sentry/preprod/eap/write.py
@@ -23,6 +23,8 @@
 from sentry.utils.arroyo_producer import SingletonProducer, get_arroyo_producer
 from sentry.utils.kafka_config import get_topic_definition
 
+THIRTEEN_MONTHS = 396  # 13 months in days
+
 
 def produce_preprod_size_metric_to_eap(
     size_metric: PreprodArtifactSizeMetrics,
@@ -109,7 +111,7 @@ def produce_preprod_size_metric_to_eap(
         timestamp=proto_timestamp,
         trace_id=trace_id,
         received=received,
-        retention_days=90,  # Default retention for preprod data
+        retention_days=THIRTEEN_MONTHS,  # Default retention for preprod data
         attributes={k: anyvalue(v) for k, v in attributes.items() if v is not None},
         client_sample_rate=1.0,
         server_sample_rate=1.0,
@@ -217,7 +219,7 @@ def produce_preprod_build_distribution_to_eap(
         timestamp=proto_timestamp,
         trace_id=trace_id,
         received=received,
-        retention_days=90,
+        retention_days=THIRTEEN_MONTHS,
         attributes={k: anyvalue(v) for k, v in attributes.items() if v is not None},
         client_sample_rate=1.0,
         server_sample_rate=1.0,
diff --git a/tests/sentry/preprod/eap/test_write.py b/tests/sentry/preprod/eap/test_write.py
index d77c3ddd495167..bbc7df160f721c 100644
--- a/tests/sentry/preprod/eap/test_write.py
+++ b/tests/sentry/preprod/eap/test_write.py
@@ -7,6 +7,7 @@
 from sentry.conf.types.kafka_definition import Topic, get_topic_codec
 from sentry.models.commitcomparison import CommitComparison
 from sentry.preprod.eap.write import (
+    THIRTEEN_MONTHS,
     produce_preprod_build_distribution_to_eap,
     produce_preprod_size_metric_to_eap,
 )
@@ -82,7 +83,7 @@ def test_write_preprod_size_metric_encodes_all_fields_correctly(self, mock_produ
         assert trace_item.organization_id == self.organization.id
         assert trace_item.project_id == self.project.id
         assert trace_item.item_type == TraceItemType.TRACE_ITEM_TYPE_PREPROD
-        assert trace_item.retention_days == 90
+        assert trace_item.retention_days == THIRTEEN_MONTHS
 
         attrs = trace_item.attributes
 
@@ -231,7 +232,7 @@ def test_write_preprod_build_distribution_encodes_all_fields_correctly(self, moc
         assert trace_item.organization_id == self.organization.id
         assert trace_item.project_id == self.project.id
         assert trace_item.item_type == TraceItemType.TRACE_ITEM_TYPE_PREPROD
-        assert trace_item.retention_days == 90
+        assert trace_item.retention_days == THIRTEEN_MONTHS
 
         attrs = trace_item.attributes