diff --git a/content/code/2023-10-11-python-date-conversion.md b/content/code/2023-10-11-python-date-conversion.md
index e5fb33e..d4887aa 100644
--- a/content/code/2023-10-11-python-date-conversion.md
+++ b/content/code/2023-10-11-python-date-conversion.md
@@ -8,9 +8,10 @@ I found myself wanting to convert a string to a duration (int), for some configu
 Something you can call like this:
 
 ```python
-string_to_duration("1d", target="days") # returns 1
-string_to_duration("1d", target="hours") # returns 24
-string_to_duration("3m", target="hours") # returns 3 * 24 * 30
+string_to_duration("1d", target="days")
+string_to_duration("1d", target="hours")
+string_to_duration("3m", target="hours")
+string_to_duration("3m", target="minutes")
 ```
 
 The code :
@@ -18,32 +19,42 @@ The code :
 ```python
 from typing import Literal
 
-
-def string_to_duration(value: str, target: Literal["days", "hours"]):
-    """Convert a string to a number of hours, or days"""
+def string_to_duration(value: str, target: Literal["days", "hours", "minutes"]):
+    """Convert a string to a number of hours, days or minutes"""
     num = int("".join(filter(str.isdigit, value)))
 
-    if target == "hours":
-        reconvert = True
+    # It's not possible to convert from a smaller unit to a greater one:
+    # - hours and minutes cannot be converted to days
+    # - minutes cannot be converted to hours
+    if (target == "days" and ("h" in value or "m" in value.replace("mo", ""))) or (
+        target == "hours" and "m" in value.replace("mo", "")
+    ):
+        msg = (
+            "Durations cannot be converted from a smaller to a greater unit. "
+            f"(trying to convert '{value}' to {target})"
+        )
+        raise ValueError(msg, value)
 
+    # Consider we're converting to minutes, do the eventual multiplication at the end.
     if "h" in value:
-        if target == "days":
-            raise ValueError("Invalid duration value", value)
-        num = num
-        reconvert = False
+        num = num * 60
     elif "d" in value:
-        num = num
+        num = num * 60 * 24
     elif "w" in value:
-        num = num * 7
-    elif "m" in value:
-        num = num * 30
+        num = num * 60 * 24 * 7
+    elif "mo" in value:
+        num = num * 60 * 24 * 30  # considers 30d in a month
     elif "y" in value:
-        num = num * 365
+        num = num * 60 * 24 * 365
+    elif "m" in value:
+        num = num
     else:
         raise ValueError("Invalid duration value", value)
 
-    if target == "hours" and reconvert:
-        num = num * 24
+    if target == "hours":
+        num = num / 60
+    elif target == "days":
+        num = num / 60 / 24
 
     return num
 ```
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