diff --git a/src/usecase/analytics/get_placements_analytics.py b/src/usecase/analytics/get_placements_analytics.py
index 3b8b745..5614899 100644
--- a/src/usecase/analytics/get_placements_analytics.py
+++ b/src/usecase/analytics/get_placements_analytics.py
@@ -1,7 +1,9 @@
-import datetime
 import logging
+import uuid
 from typing import TYPE_CHECKING
 
+from tortoise import timezone
+
 from src import domain, dto
 
 if TYPE_CHECKING:
@@ -122,6 +124,35 @@ async def get_placements_analytics(
         else {}
     )
 
+    # Collect (channel_id, message_id) pairs for batch next post lookup
+    channel_message_pairs = [
+        (pp.post.channel_id, pp.post.message_id)
+        for p in placements
+        for pp in p.placement_posts
+        if pp.post and pp.post.published_at
+    ]
+    next_posts_map = (
+        await self.database.get_next_posts_after_batch(channel_message_pairs)
+        if channel_message_pairs
+        else {}
+    )
+
+    # Calculate time_on_top for each placement_post
+    time_on_top_map: dict[uuid.UUID, int] = {}
+    now = timezone.now()
+    for placement in placements:
+        for pp in placement.placement_posts:
+            post = pp.post
+            if not post or not post.published_at:
+                continue
+            published_at = post.published_at
+            key = (post.channel_id, post.message_id)
+            next_post = next_posts_map.get(key)
+            if next_post and next_post.published_at:
+                time_on_top_map[pp.id] = int((next_post.published_at - published_at).total_seconds())
+            else:
+                time_on_top_map[pp.id] = int((now - published_at).total_seconds())
+
     results: list[dto.PlacementAnalyticsOutput] = []
     for placement in placements:
         placement_post = placement.placement_posts[0] if placement.placement_posts else None
@@ -200,7 +231,7 @@ async def get_placements_analytics(
                 views_count=views_count,
                 cpf=cpf_value,
                 cpm=cpm_value,
-                time_on_top=placement_post.time_on_top if placement_post else None,
+                time_on_top=time_on_top_map.get(placement_post.id) if placement_post else None,
                 time_in_feed=None,
                 invite_link=placement.invite_link,
                 invite_link_created_at=placement.invite_link_created_at,