diff --git a/neko/index.js b/neko/index.js
index d50aa6385..59cd61d08 100644
--- a/neko/index.js
+++ b/neko/index.js
@@ -268,6 +268,7 @@ if (!nativeBinding) {
 const {
 	stringToAcct,
 	acctToString,
+	formatMilliseconds,
 	genString,
 	IdConvertType,
 	convertId,
@@ -278,6 +279,7 @@ const {
 
 module.exports.stringToAcct = stringToAcct;
 module.exports.acctToString = acctToString;
+module.exports.formatMilliseconds = formatMilliseconds;
 module.exports.genString = genString;
 module.exports.IdConvertType = IdConvertType;
 module.exports.convertId = convertId;
diff --git a/packages/backend/native-utils/src/util/format_milliseconds.rs b/packages/backend/native-utils/src/util/format_milliseconds.rs
new file mode 100644
index 000000000..b5fbb1e84
--- /dev/null
+++ b/packages/backend/native-utils/src/util/format_milliseconds.rs
@@ -0,0 +1,52 @@
+/// Convert milliseconds to human readable string
+#[cfg_attr(feature = "napi", napi_derive::napi)]
+pub fn format_milliseconds(milliseconds: i32) -> String {
+    let mut seconds = milliseconds / 1000;
+    let mut minutes = seconds / 60;
+    let mut hours = minutes / 60;
+    let days = hours / 24;
+
+    seconds %= 60;
+    minutes %= 60;
+    hours %= 24;
+
+    let mut buf = Vec::<String>::new();
+
+    if days > 0 {
+        buf.push(format!("{} day(s)", days));
+    }
+    if hours > 0 {
+        buf.push(format!("{} hour(s)", hours));
+    }
+    if minutes > 0 {
+        buf.push(format!("{} minute(s)", minutes));
+    }
+    if seconds > 0 {
+        buf.push(format!("{} second(s)", seconds));
+    }
+
+    buf.join(", ")
+}
+
+#[cfg(test)]
+mod unit_test {
+    use super::format_milliseconds;
+    use pretty_assertions::assert_eq;
+
+    #[test]
+    fn format_milliseconds_test() {
+        assert_eq!(format_milliseconds(1000), "1 second(s)".to_string());
+        assert_eq!(
+            format_milliseconds(1387938),
+            "23 minute(s), 7 second(s)".to_string()
+        );
+        assert_eq!(
+            format_milliseconds(34200457),
+            "9 hour(s), 30 minute(s)".to_string()
+        );
+        assert_eq!(
+            format_milliseconds(998244353),
+            "11 day(s), 13 hour(s), 17 minute(s), 24 second(s)".to_string()
+        );
+    }
+}
diff --git a/packages/backend/native-utils/src/util/mod.rs b/packages/backend/native-utils/src/util/mod.rs
index 6f286a479..3a5461101 100644
--- a/packages/backend/native-utils/src/util/mod.rs
+++ b/packages/backend/native-utils/src/util/mod.rs
@@ -1,3 +1,4 @@
 pub mod acct;
+pub mod format_milliseconds;
 pub mod id;
 pub mod random;
diff --git a/packages/backend/src/misc/convert-milliseconds.ts b/packages/backend/src/misc/convert-milliseconds.ts
deleted file mode 100644
index d8c163ffd..000000000
--- a/packages/backend/src/misc/convert-milliseconds.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-export function convertMilliseconds(ms: number) {
-	let seconds = Math.round(ms / 1000);
-	let minutes = Math.round(seconds / 60);
-	let hours = Math.round(minutes / 60);
-	const days = Math.round(hours / 24);
-	seconds %= 60;
-	minutes %= 60;
-	hours %= 24;
-
-	const result = [];
-	if (days > 0) result.push(`${days} day(s)`);
-	if (hours > 0) result.push(`${hours} hour(s)`);
-	if (minutes > 0) result.push(`${minutes} minute(s)`);
-	if (seconds > 0) result.push(`${seconds} second(s)`);
-
-	return result.join(", ");
-}
diff --git a/packages/backend/src/server/api/limiter.ts b/packages/backend/src/server/api/limiter.ts
index f03f8754c..d9bd5f486 100644
--- a/packages/backend/src/server/api/limiter.ts
+++ b/packages/backend/src/server/api/limiter.ts
@@ -2,7 +2,7 @@ import Limiter from "ratelimiter";
 import Logger from "@/services/logger.js";
 import { redisClient } from "@/db/redis.js";
 import type { IEndpointMeta } from "./endpoints.js";
-import { convertMilliseconds } from "@/misc/convert-milliseconds.js";
+import { formatMilliseconds } from "native-utils/built/index.js";
 
 const logger = new Logger("limiter");
 
@@ -78,7 +78,7 @@ export const limiter = (
 				if (info.remaining === 0) {
 					reject({
 						message: "RATE_LIMIT_EXCEEDED",
-						remainingTime: convertMilliseconds(info.resetMs - Date.now()),
+						remainingTime: formatMilliseconds(info.resetMs - Date.now()),
 					});
 				} else {
 					ok();