diff --git a/inferencex-e2e/infx/bench/agentic/replay.py b/inferencex-e2e/infx/bench/agentic/replay.py
index 221677330d..a78787d8a7 100644
--- a/inferencex-e2e/infx/bench/agentic/replay.py
+++ b/inferencex-e2e/infx/bench/agentic/replay.py
@@ -52,6 +52,8 @@ class ReplayConfig:
     dataset: str
     apply_chat_template: bool
     benchmark_grace_period: str | None
+    slice_duration: str | None
+    """``AIPERF_SLICE_DURATION``: timeslice width in seconds; unset leaves the scenario default."""
 
     @classmethod
     def from_env(cls, env: Mapping[str, str], result_dir: Path) -> ReplayConfig:
@@ -98,6 +100,7 @@ def from_env(cls, env: Mapping[str, str], result_dir: Path) -> ReplayConfig:
             dataset=dataset,
             apply_chat_template=env.get("AIPERF_APPLY_CHAT_TEMPLATE") == "true",
             benchmark_grace_period=inputs.optional("AIPERF_BENCHMARK_GRACE_PERIOD", env),
+            slice_duration=inputs.optional("AIPERF_SLICE_DURATION", env),
         )
 
 
@@ -164,4 +167,6 @@ def replay_argv(cfg: ReplayConfig, cli: str | Path) -> list[str]:
         argv.append("--apply-chat-template")
     if cfg.benchmark_grace_period is not None:
         argv += ["--benchmark-grace-period", cfg.benchmark_grace_period]
+    if cfg.slice_duration is not None:
+        argv += ["--slice-duration", cfg.slice_duration]
     return argv
diff --git a/inferencex-e2e/infx/tests/bench/test_agentic_replay.py b/inferencex-e2e/infx/tests/bench/test_agentic_replay.py
index 46eb7d2163..1b588a5a19 100644
--- a/inferencex-e2e/infx/tests/bench/test_agentic_replay.py
+++ b/inferencex-e2e/infx/tests/bench/test_agentic_replay.py
@@ -62,6 +62,7 @@ def test_opt_in_inputs_add_their_flags_in_place():
         WEKA_LOADER_OVERRIDE=traces.UNCAPPED,
         AIPERF_APPLY_CHAT_TEMPLATE="true",
         AIPERF_BENCHMARK_GRACE_PERIOD="1800",
+        AIPERF_SLICE_DURATION="3600",
     )
 
     assert argv == [
@@ -77,6 +78,7 @@ def test_opt_in_inputs_add_their_flags_in_place():
         "--output-artifact-dir", "/results/aiperf_artifacts",
         "--public-dataset", traces.UNCAPPED,
         "--apply-chat-template", "--benchmark-grace-period", "1800",
+        "--slice-duration", "3600",
     ]  # fmt: skip