diff --git a/composer/callbacks/runtime_estimator.py b/composer/callbacks/runtime_estimator.py
index 29afffa9d2..b0fc96e20b 100644
--- a/composer/callbacks/runtime_estimator.py
+++ b/composer/callbacks/runtime_estimator.py
@@ -79,7 +79,7 @@ def load_state_dict(self, state: Dict[str, Any]) -> None:
         self.eval_frequency_per_label = state['eval_frequency_per_label']
         self.last_elapsed_fraction = state['last_elapsed_fraction']
 
-    def get_elapsed_duration(self, state: State) -> Optional[float]:
+    def _get_elapsed_duration(self, state: State) -> Optional[float]:
         """Get the elapsed duration.
 
         Unlike `state.get_elapsed_duration`, this method computes fractional progress in an epoch
@@ -102,7 +102,7 @@ def get_elapsed_duration(self, state: State) -> Optional[float]:
     def batch_start(self, state: State, logger: Logger) -> None:
         if self._enabled and self.start_time is None and self.batches_left_to_skip == 0:
             self.start_time = time.time()
-            self.start_dur = self.get_elapsed_duration(state)
+            self.start_dur = self._get_elapsed_duration(state)
             if self.start_dur is None:
                 warnings.warn('`max_duration` is not set. Cannot estimate remaining time.')
                 self._enabled = False
@@ -114,7 +114,7 @@ def batch_end(self, state: State, logger: Logger) -> None:
             self.batches_left_to_skip -= 1
             return
 
-        elapsed_dur = self.get_elapsed_duration(state)
+        elapsed_dur = self._get_elapsed_duration(state)
         assert elapsed_dur is not None, 'max_duration checked as non-None on batch_start'
 
         assert self.start_dur is not None
@@ -153,7 +153,7 @@ def eval_end(self, state: State, logger: Logger) -> None:
         if state.dataloader_label not in self.eval_wct_per_label:
             self.eval_wct_per_label[state.dataloader_label] = []
         self.eval_wct_per_label[state.dataloader_label].append(state.eval_timestamp.total_wct.total_seconds())
-        elapsed_fraction = self.get_elapsed_duration(state)
+        elapsed_fraction = self._get_elapsed_duration(state)
         assert elapsed_fraction is not None, 'max_duration checked as non-None on batch_start'
         num_evals_finished = len(self.eval_wct_per_label[state.dataloader_label])
         self.eval_frequency_per_label[state.dataloader_label] = elapsed_fraction / num_evals_finished
diff --git a/docs/source/trainer/callbacks.rst b/docs/source/trainer/callbacks.rst
index 1573ba0afd..a12cdf5e52 100644
--- a/docs/source/trainer/callbacks.rst
+++ b/docs/source/trainer/callbacks.rst
@@ -46,6 +46,7 @@ components of training.
 
     ~checkpoint_saver.CheckpointSaver
     ~speed_monitor.SpeedMonitor
+    ~runtime_estimator.RuntimeEstimator
     ~lr_monitor.LRMonitor
     ~optimizer_monitor.OptimizerMonitor
     ~memory_monitor.MemoryMonitor