diff --git a/rest_framework/throttling.py b/rest_framework/throttling.py
index 5f0272c10..3af69c4ad 100644
--- a/rest_framework/throttling.py
+++ b/rest_framework/throttling.py
@@ -7,9 +7,6 @@ from django.core.cache import cache as default_cache
 from django.core.exceptions import ImproperlyConfigured
 
 from rest_framework.settings import api_settings
-from rest_framework.utils.throttling_duration_parser import (
-    parse_quantity_and_unit
-)
 
 
 class BaseThrottle:
@@ -97,6 +94,24 @@ class SimpleRateThrottle(BaseThrottle):
             msg = "No default throttle rate set for '%s' scope" % self.scope
             raise ImproperlyConfigured(msg)
 
+    def parse_quantity_and_unit(self, quantity_unit_string):
+        """
+        Parse a combined quantity and unit string and return a tuple with parsed values.
+
+        Returns:
+            tuple: A tuple containing the parsed values (quantity, unit).
+        """
+        i = 0
+        while i < len(quantity_unit_string) and quantity_unit_string[i].isnumeric():
+            i += 1
+
+        if i == 0:
+            return (1, quantity_unit_string)
+        else:
+            quantity = int(quantity_unit_string[:i])
+            unit = quantity_unit_string[i:]
+            return (quantity, unit)
+
     def parse_rate(self, rate):
         """
         Given the request rate string, return a two tuple of:
@@ -105,7 +120,7 @@ class SimpleRateThrottle(BaseThrottle):
         if rate is None:
             return (None, None)
         num, period = rate.split('/')
-        quantity, unit = parse_quantity_and_unit(period)
+        quantity, unit = self.parse_quantity_and_unit(period)
         num_requests = int(num)
         duration = {'s': 1, 'm': 60, 'h': 3600, 'd': 86400}[unit[0]]
         total_duration = duration * int(quantity)
diff --git a/rest_framework/utils/throttling_duration_parser.py b/rest_framework/utils/throttling_duration_parser.py
deleted file mode 100644
index b8d2b30be..000000000
--- a/rest_framework/utils/throttling_duration_parser.py
+++ /dev/null
@@ -1,21 +0,0 @@
-def parse_quantity_and_unit(quantity_unit_string):
-    """
-    Parse a combined quantity and unit string and return a dictionary containing the parsed values.
-
-    Args:
-        quantity_unit_string (str): A string that combines a numeric quantity and a unit, e.g., "5min", "10h".
-
-    Returns:
-        dict: A dictionary containing the parsed quantity and unit, with keys 'quantity' and 'unit'.
-              If the input string contains only a unit (e.g., "m"), quantity will be set to 1.
-    """
-    i = 0
-    while i < len(quantity_unit_string) and quantity_unit_string[i].isnumeric():
-        i += 1
-
-    if i == 0:
-        return (1, quantity_unit_string)
-    else:
-        quantity = int(quantity_unit_string[:i])
-        unit = quantity_unit_string[i:]
-        return (quantity, unit)
diff --git a/tests/test_throttling.py b/tests/test_throttling.py
index dbbaf9453..d0aa0584c 100644
--- a/tests/test_throttling.py
+++ b/tests/test_throttling.py
@@ -15,10 +15,7 @@ from rest_framework.settings import api_settings
 from rest_framework.test import APIRequestFactory, force_authenticate
 from rest_framework.throttling import (
     AnonRateThrottle, BaseThrottle, ScopedRateThrottle, SimpleRateThrottle,
-    UserRateThrottle
-)
-from rest_framework.utils.throttling_duration_parser import (
-    parse_quantity_and_unit
+    UserRateThrottle, parse_quantity_and_unit
 )
 from rest_framework.views import APIView