diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/time/formatToDecimals.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/time/DurationNative.kt
similarity index 88%
rename from kotlin-native/runtime/src/main/kotlin/kotlin/time/formatToDecimals.kt
rename to kotlin-native/runtime/src/main/kotlin/kotlin/time/DurationNative.kt
index 0ada5a7480f..155b8215350 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/time/formatToDecimals.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/time/DurationNative.kt
@@ -7,6 +7,8 @@ package kotlin.time
 
 import kotlin.native.internal.GCUnsafeCall
 
+internal actual inline val durationAssertionsEnabled: Boolean get() = true
+
 @GCUnsafeCall("Kotlin_DurationValue_formatToExactDecimals")
 internal actual external fun formatToExactDecimals(value: Double, decimals: Int): String
 
diff --git a/libraries/stdlib/js/src/kotlin/time/formatToDecimals.kt b/libraries/stdlib/js/src/kotlin/time/DurationJs.kt
similarity index 94%
rename from libraries/stdlib/js/src/kotlin/time/formatToDecimals.kt
rename to libraries/stdlib/js/src/kotlin/time/DurationJs.kt
index f4f958ae3ce..37661def558 100644
--- a/libraries/stdlib/js/src/kotlin/time/formatToDecimals.kt
+++ b/libraries/stdlib/js/src/kotlin/time/DurationJs.kt
@@ -8,6 +8,8 @@ package kotlin.time
 import kotlin.js.json
 import kotlin.math.*
 
+internal actual inline val durationAssertionsEnabled: Boolean get() = true
+
 internal actual fun formatToExactDecimals(value: Double, decimals: Int): String {
     val rounded = if (decimals == 0) {
         value
diff --git a/libraries/stdlib/jvm/src/kotlin/time/formatToDecimals.kt b/libraries/stdlib/jvm/src/kotlin/time/DurationJvm.kt
similarity index 91%
rename from libraries/stdlib/jvm/src/kotlin/time/formatToDecimals.kt
rename to libraries/stdlib/jvm/src/kotlin/time/DurationJvm.kt
index 2ea65d1dff3..e904507dcc7 100644
--- a/libraries/stdlib/jvm/src/kotlin/time/formatToDecimals.kt
+++ b/libraries/stdlib/jvm/src/kotlin/time/DurationJvm.kt
@@ -9,6 +9,8 @@ import java.math.RoundingMode
 import java.text.DecimalFormat
 import kotlin.concurrent.getOrSet
 
+internal actual val durationAssertionsEnabled: Boolean = Duration::class.java.desiredAssertionStatus()
+
 private val precisionFormats = Array(4) { ThreadLocal<DecimalFormat>() }
 
 private fun createFormatForDecimals(decimals: Int) = DecimalFormat("0").apply {
diff --git a/libraries/stdlib/src/kotlin/time/Duration.kt b/libraries/stdlib/src/kotlin/time/Duration.kt
index 181e9fca7ff..f2601ab678a 100644
--- a/libraries/stdlib/src/kotlin/time/Duration.kt
+++ b/libraries/stdlib/src/kotlin/time/Duration.kt
@@ -38,12 +38,13 @@ public value class Duration internal constructor(private val rawValue: Long) : C
     private val storageUnit get() = if (isInNanos()) DurationUnit.NANOSECONDS else DurationUnit.MILLISECONDS
 
     init {
-        // TODO: disable assertions in final version
-        if (isInNanos()) {
-            if (value !in -MAX_NANOS..MAX_NANOS) throw AssertionError("$value ns is out of nanoseconds range")
-        } else {
-            if (value !in -MAX_MILLIS..MAX_MILLIS) throw AssertionError("$value ms is out of milliseconds range")
-            if (value in -MAX_NANOS_IN_MILLIS..MAX_NANOS_IN_MILLIS) throw AssertionError("$value ms is denormalized")
+        if (durationAssertionsEnabled) {
+            if (isInNanos()) {
+                if (value !in -MAX_NANOS..MAX_NANOS) throw AssertionError("$value ns is out of nanoseconds range")
+            } else {
+                if (value !in -MAX_MILLIS..MAX_MILLIS) throw AssertionError("$value ms is out of milliseconds range")
+                if (value in -MAX_NANOS_IN_MILLIS..MAX_NANOS_IN_MILLIS) throw AssertionError("$value ms is denormalized")
+            }
         }
     }
 
@@ -1421,6 +1422,7 @@ private fun durationOfMillisNormalized(millis: Long) =
         durationOfMillis(millis.coerceIn(-MAX_MILLIS, MAX_MILLIS))
     }
 
+internal expect val durationAssertionsEnabled: Boolean
 
 internal expect fun formatToExactDecimals(value: Double, decimals: Int): String
 internal expect fun formatUpToDecimals(value: Double, decimals: Int): String
\ No newline at end of file
diff --git a/libraries/stdlib/wasm/src/kotlin/time/Duration.kt b/libraries/stdlib/wasm/src/kotlin/time/Duration.kt
index 45159fb8928..0f204149709 100644
--- a/libraries/stdlib/wasm/src/kotlin/time/Duration.kt
+++ b/libraries/stdlib/wasm/src/kotlin/time/Duration.kt
@@ -4,5 +4,6 @@
  */
 package kotlin.time
 
+internal actual inline val durationAssertionsEnabled: Boolean get() = true
 internal actual fun formatToExactDecimals(value: Double, decimals: Int): String = TODO("Wasm stdlib: Duration")
 internal actual fun formatUpToDecimals(value: Double, decimals: Int): String = TODO("Wasm stdlib: Duration")
\ No newline at end of file