fix(description): use regex for minute suffix replacement instead of blanket .replace

pr_agent/algo/utils.py

@@ -125,6 +125,16 @@ def unique_strings(input_list: List[str]) -> List[str]:
     return unique_list
 
 
+def _expand_minute_suffix(text: str) -> str:
+    """Replace minute abbreviations like '30m' with '30 minutes'.
+
+    Only replaces when 'm' appears at a word boundary after digits
+    (e.g. "30m" -> "30 minutes"), leaving partial-unit strings like
+    "30ms" or "30min" unchanged.
+    """
+    return re.sub(r'(\d+)m\b', r'\1 minutes', text)
+
+
 def convert_to_markdown_v2(output_data: dict,
                            gfm_supported: bool = True,
                            incremental_review=None,
@@ -214,11 +224,17 @@ def convert_to_markdown_v2(output_data: dict,
         elif 'contribution time cost estimate' in key_nice.lower():
             if gfm_supported:
                 markdown_text += f"<tr><td>{emoji}&nbsp;<strong>Contribution time estimate</strong> (best, average, worst case): "
-                markdown_text += f"{value['best_case'].replace('m', ' minutes')} | {value['average_case'].replace('m', ' minutes')} | {value['worst_case'].replace('m', ' minutes')}"
+                best = _expand_minute_suffix(value['best_case'])
+                avg = _expand_minute_suffix(value['average_case'])
+                worst = _expand_minute_suffix(value['worst_case'])
+                markdown_text += f"{best} | {avg} | {worst}"
                 markdown_text += f"</td></tr>\n"
             else:
                 markdown_text += f"### {emoji} Contribution time estimate (best, average, worst case): "
-                markdown_text += f"{value['best_case'].replace('m', ' minutes')} | {value['average_case'].replace('m', ' minutes')} | {value['worst_case'].replace('m', ' minutes')}\n\n"
+                best = _expand_minute_suffix(value['best_case'])
+                avg = _expand_minute_suffix(value['average_case'])
+                worst = _expand_minute_suffix(value['worst_case'])
+                markdown_text += f"{best} | {avg} | {worst}\n\n"
         elif 'security concerns' in key_nice.lower():
             if gfm_supported:
                 markdown_text += f"<tr><td>"

tests/unittest/test_convert_to_markdown.py

@@ -2,7 +2,7 @@
 import textwrap
 from unittest.mock import Mock
 
-from pr_agent.algo.utils import PRReviewHeader, convert_to_markdown_v2
+from pr_agent.algo.utils import PRReviewHeader, _expand_minute_suffix, convert_to_markdown_v2
 from pr_agent.tools.pr_description import insert_br_after_x_chars
 
 """
@@ -303,3 +303,23 @@ def test_br3(self):
                                               '</code> and implements <br>aaa')
         # print("-----")
         # print(file_change_description_br)
+
+
+class TestExpandMinuteSuffix:
+    """Tests for _expand_minute_suffix regex replacement."""
+
+    def test_standalone_minute_suffix(self):
+        """'30m' at end of string becomes '30 minutes'."""
+        assert _expand_minute_suffix("30m") == "30 minutes"
+
+    def test_minute_suffix_not_replaced_when_part_of_longer_unit(self):
+        """'30ms' stays unchanged because 'm' is not at a word boundary."""
+        assert _expand_minute_suffix("30ms") == "30ms"
+
+    def test_minute_suffix_replaced_before_space(self):
+        """'30m implementation' replaces '30m' because 'm' is at a word boundary."""
+        assert _expand_minute_suffix("30m implementation") == "30 minutes implementation"
+
+    def test_minute_suffix_in_compound_estimate(self):
+        """'2h 30m' becomes '2h 30 minutes' (only the minute part is replaced)."""
+        assert _expand_minute_suffix("2h 30m") == "2h 30 minutes"