diff --git a/x-pack/plugins/observability_solution/profiling/server/routes/apm.ts b/x-pack/plugins/observability_solution/profiling/server/routes/apm.ts
index f77d121a699d2..e5119c17ee5da 100644
--- a/x-pack/plugins/observability_solution/profiling/server/routes/apm.ts
+++ b/x-pack/plugins/observability_solution/profiling/server/routes/apm.ts
@@ -83,6 +83,7 @@ export function registerTopNFunctionsAPMTransactionsRoute({
               indices: transactionIndices.split(','),
               stacktraceIdsField: 'transaction.profiler_stack_trace_ids',
               limit: 1000,
+              totalSeconds: endSecs - startSecs,
             });
             const apmFunction = apmFunctions.TopN.find(
               (topNFunction) => topNFunction.Frame.FunctionName === functionName