diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3374159..609bddb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Version 2.0.1] — 2024-08-22
+
+* Now that constants are namespaced, remove the `defined()` checks and unnecessary multiplication in order to a) help IDEs and b) remove an (albeit tiny) level of overhead ([#21])
+
 ## [Version 2.0.0] — 2024-08-20
 
 **⚠️ Please note:** this is a **major** release, as it contains a breaking change to how the constants are defined. An extra file has been included to help bridge the gap between versions if you wish to run version 2.x of this library without updating all references across your app(s).
@@ -99,6 +103,7 @@ Initial public release of the library, with the following constants:
 
 
 [Unreleased]: https://github.com/stevegrunwell/time-constants/compare/main...develop
+[Version 2.0.1]: https://github.com/stevegrunwell/time-constants/releases/tag/v2.0.1
 [Version 2.0.0]: https://github.com/stevegrunwell/time-constants/releases/tag/v2.0.0
 [Version 1.2.0]: https://github.com/stevegrunwell/time-constants/releases/tag/v1.2.0
 [Version 1.1.2]: https://github.com/stevegrunwell/time-constants/releases/tag/v1.1.2
@@ -116,3 +121,4 @@ Initial public release of the library, with the following constants:
 [#17]: https://github.com/stevegrunwell/time-constants/pull/17
 [#18]: https://github.com/stevegrunwell/time-constants/pull/18
 [#19]: https://github.com/stevegrunwell/time-constants/pull/19
+[#21]: https://github.com/stevegrunwell/time-constants/pull/21
diff --git a/src/Constants.php b/src/Constants.php
index e730198..11bc018 100644
--- a/src/Constants.php
+++ b/src/Constants.php
@@ -19,40 +19,40 @@
  * @link https://codex.wordpress.org/Easier_Expression_of_Time_Constants
  */
 
-/* One second. */
-if (!defined(__NAMESPACE__ . '\\ONE_SECOND')) {
-    define(__NAMESPACE__ . '\\ONE_SECOND', 1);
-}
-
-/* One minute = 60 seconds. */
-if (!defined(__NAMESPACE__ . '\\MINUTE_IN_SECONDS')) {
-    define(__NAMESPACE__ . '\\MINUTE_IN_SECONDS', 60);
-}
-
-/* One hour = 60 minutes. */
-if (!defined(__NAMESPACE__ . '\\HOUR_IN_SECONDS')) {
-    define(__NAMESPACE__ . '\\HOUR_IN_SECONDS', 60 * MINUTE_IN_SECONDS);
-}
-
-/* One day = 24 hours. */
-if (!defined(__NAMESPACE__ . '\\DAY_IN_SECONDS')) {
-    define(__NAMESPACE__ . '\\DAY_IN_SECONDS', 24 * HOUR_IN_SECONDS);
-}
-
-/* One week = 7 days. */
-if (!defined(__NAMESPACE__ . '\\WEEK_IN_SECONDS')) {
-    define(__NAMESPACE__ . '\\WEEK_IN_SECONDS', 7 * DAY_IN_SECONDS);
-}
-
-/* For common usage, assume one month = 30 days. */
-if (!defined(__NAMESPACE__ . '\\MONTH_IN_SECONDS')) {
-    define(__NAMESPACE__ . '\\MONTH_IN_SECONDS', 30 * DAY_IN_SECONDS);
-}
-
-/* For common usage, assume one year = 365 days. */
-if (!defined(__NAMESPACE__ . '\\YEAR_IN_SECONDS')) {
-    define(__NAMESPACE__ . '\\YEAR_IN_SECONDS', 365 * DAY_IN_SECONDS);
-}
+/**
+ * One second.
+ */
+define(__NAMESPACE__ . '\\ONE_SECOND', 1);
+
+/**
+ * One minute is 60 seconds.
+ */
+define(__NAMESPACE__ . '\\MINUTE_IN_SECONDS', 60);
+
+/**
+ * One hour is 60 minutes.
+ */
+define(__NAMESPACE__ . '\\HOUR_IN_SECONDS', 3600);
+
+/**
+ * One day is 24 hours.
+ */
+define(__NAMESPACE__ . '\\DAY_IN_SECONDS', 86400);
+
+/**
+ * One week is 7 days.
+ */
+define(__NAMESPACE__ . '\\WEEK_IN_SECONDS', 604800);
+
+/**
+ * For general purposes, assume that one month is 30 days.
+ */
+define(__NAMESPACE__ . '\\MONTH_IN_SECONDS', 2592000);
+
+/**
+ * For general purposes, assume that one year is 365 days.
+ */
+define(__NAMESPACE__ . '\\YEAR_IN_SECONDS', 31536000);
 
 /**
  * Time based in minutes.
@@ -61,35 +61,35 @@
  * constants provide similar functionality.
  */
 
-/* One minute. */
-if (!defined(__NAMESPACE__ . '\\ONE_MINUTE')) {
-    define(__NAMESPACE__ . '\\ONE_MINUTE', 1);
-}
+/**
+ *  One minute.
+ */
+define(__NAMESPACE__ . '\\ONE_MINUTE', 1);
 
-/* One hour = 60 minutes. */
-if (!defined(__NAMESPACE__ . '\\HOUR_IN_MINUTES')) {
-    define(__NAMESPACE__ . '\\HOUR_IN_MINUTES', 60);
-}
+/**
+ * One hour is 60 minutes.
+ */
+define(__NAMESPACE__ . '\\HOUR_IN_MINUTES', 60);
 
-/* One day = 24 hours. */
-if (!defined(__NAMESPACE__ . '\\DAY_IN_MINUTES')) {
-    define(__NAMESPACE__ . '\\DAY_IN_MINUTES', 24 * HOUR_IN_MINUTES);
-}
+/**
+ * One day is 24 hours.
+ */
+define(__NAMESPACE__ . '\\DAY_IN_MINUTES', 1440);
 
-/* One week = 7 days. */
-if (!defined(__NAMESPACE__ . '\\WEEK_IN_MINUTES')) {
-    define(__NAMESPACE__ . '\\WEEK_IN_MINUTES', 7 * DAY_IN_MINUTES);
-}
+/**
+ * One week is 7 days.
+ */
+define(__NAMESPACE__ . '\\WEEK_IN_MINUTES', 10080);
 
-/* For common usage, assume one month = 30 days. */
-if (!defined(__NAMESPACE__ . '\\MONTH_IN_MINUTES')) {
-    define(__NAMESPACE__ . '\\MONTH_IN_MINUTES', 30 * DAY_IN_MINUTES);
-}
+/**
+ * For general purposes, assume that one month is 30 days.
+ */
+define(__NAMESPACE__ . '\\MONTH_IN_MINUTES', 43200);
 
-/* For common usage, assume one year = 365 days. */
-if (!defined(__NAMESPACE__ . '\\YEAR_IN_MINUTES')) {
-    define(__NAMESPACE__ . '\\YEAR_IN_MINUTES', 365 * DAY_IN_MINUTES);
-}
+/**
+ * For general purposes, assume that one year is 365 days.
+ */
+define(__NAMESPACE__ . '\\YEAR_IN_MINUTES', 525600);
 
 /**
  * Common multipliers.
@@ -97,22 +97,22 @@
  * These are useful when dealing with timing and things like cache expirations.
  */
 
-/* A millisecond is 1/1000 of a second. */
-if (!defined(__NAMESPACE__ . '\\MILLISECONDS_PER_SECOND')) {
-    define(__NAMESPACE__ . '\\MILLISECONDS_PER_SECOND', 1000);
-}
+/**
+ * A millisecond is 1/1000 of a second.
+ */
+define(__NAMESPACE__ . '\\MILLISECONDS_PER_SECOND', 1000);
 
-/* A microsecond is one millionth of a second. */
-if (!defined(__NAMESPACE__ . '\\MICROSECONDS_PER_SECOND')) {
-    define(__NAMESPACE__ . '\\MICROSECONDS_PER_SECOND', 1000000);
-}
+/**
+ * A microsecond is one millionth of a second.
+ */
+define(__NAMESPACE__ . '\\MICROSECONDS_PER_SECOND', 1000000);
 
-/* A nanosecond is one billionth of a second. */
-if (!defined(__NAMESPACE__ . '\\NANOSECONDS_PER_SECOND')) {
-    define(__NAMESPACE__ . '\\NANOSECONDS_PER_SECOND', 1000000000);
-}
+/**
+ * A nanosecond is one billionth of a second.
+ */
+define(__NAMESPACE__ . '\\NANOSECONDS_PER_SECOND', 1000000000);
 
-/* A picosecond is one trillionth of a second. */
-if (!defined(__NAMESPACE__ . '\\PICOSECONDS_PER_SECOND')) {
-    define(__NAMESPACE__ . '\\PICOSECONDS_PER_SECOND', 1000000000000);
-}
+/**
+ * A picosecond is one trillionth of a second.
+ */
+define(__NAMESPACE__ . '\\PICOSECONDS_PER_SECOND', 1000000000000);