diff --git a/airbyte-cdk/python/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py b/airbyte-cdk/python/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py
index d905a74f774d..045cf366cf2c 100644
--- a/airbyte-cdk/python/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py
+++ b/airbyte-cdk/python/airbyte_cdk/sources/declarative/incremental/global_substream_cursor.py
@@ -54,10 +54,12 @@ def start(self) -> None:
         self._start = time.perf_counter_ns()
 
     def finish(self) -> int:
-        if self._start:
-            return ((time.perf_counter_ns() - self._start) / 1e9).__ceil__()
-        else:
-            raise RuntimeError("Global substream cursor timer not started")
+        start_time = self._start
+        if start_time is None:
+            raise RuntimeError("Timer not started")
+
+        elapsed_ns = time.perf_counter_ns() - start_time
+        return -(-elapsed_ns // 1_000_000_000)
 
 
 class GlobalSubstreamCursor(DeclarativeCursor):