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diff --git a/guide/example/example-builtin-12.kt b/guide/example/example-builtin-12.kt
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+// This file was automatically generated from builtin-classes.md by Knit tool. Do not edit.
+package example.exampleBuiltin12
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.*
+
+import kotlin.time.*
+
+fun main() {
+    val duration = 1000.toDuration(DurationUnit.SECONDS)
+    println(Json.encodeToString(duration))
+}