diff --git a/packages/backend/src/misc/convert-milliseconds.ts b/packages/backend/src/misc/convert-milliseconds.ts
new file mode 100644
index 0000000000..d8c163ffda
--- /dev/null
+++ b/packages/backend/src/misc/convert-milliseconds.ts
@@ -0,0 +1,17 @@
+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/call.ts b/packages/backend/src/server/api/call.ts
index 45471ed564..0a1027b835 100644
--- a/packages/backend/src/server/api/call.ts
+++ b/packages/backend/src/server/api/call.ts
@@ -66,8 +66,11 @@ export default async (
 			limit as IEndpointMeta["limit"] & { key: NonNullable<string> },
 			limitActor,
 		).catch((e) => {
+			const remainingTime = e.remainingTime
+				? `Please try again in ${e.remainingTime}.`
+				: "Please try again later.";
 			throw new ApiError({
-				message: "Rate limit exceeded. Please try again later.",
+				message: `Rate limit exceeded. ${remainingTime}`,
 				code: "RATE_LIMIT_EXCEEDED",
 				id: "d5826d14-3982-4d2e-8011-b9e9f02499ef",
 				httpStatusCode: 429,
@@ -94,7 +97,7 @@ export default async (
 	}
 
 	if (ep.meta.requireAdmin && !user!.isAdmin) {
-		throw new ApiError(accessDenied, { reason: "You are not the admin." });
+		throw new ApiError(accessDenied, { reason: "You are not an admin." });
 	}
 
 	if (ep.meta.requireModerator && !isModerator) {
diff --git a/packages/backend/src/server/api/limiter.ts b/packages/backend/src/server/api/limiter.ts
index dd005ad136..a661ed0e95 100644
--- a/packages/backend/src/server/api/limiter.ts
+++ b/packages/backend/src/server/api/limiter.ts
@@ -3,6 +3,7 @@ import { CacheableLocalUser, User } from "@/models/entities/user.js";
 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";
 
 const logger = new Logger("limiter");
 
@@ -76,7 +77,10 @@ export const limiter = (
 				);
 
 				if (info.remaining === 0) {
-					reject("RATE_LIMIT_EXCEEDED");
+					reject({
+						message: "RATE_LIMIT_EXCEEDED",
+						remainingTime: convertMilliseconds(info.resetMs),
+					});
 				} else {
 					ok();
 				}
diff --git a/packages/backend/src/server/api/openapi/errors.ts b/packages/backend/src/server/api/openapi/errors.ts
index 0fe229d88e..9e7c77c0f2 100644
--- a/packages/backend/src/server/api/openapi/errors.ts
+++ b/packages/backend/src/server/api/openapi/errors.ts
@@ -3,7 +3,7 @@ export const errors = {
 		INVALID_PARAM: {
 			value: {
 				error: {
-					message: "Invalid param.",
+					message: "Invalid parameter.",
 					code: "INVALID_PARAM",
 					id: "3d81ceae-475f-4600-b2a8-2bc116157532",
 				},
@@ -25,8 +25,7 @@ export const errors = {
 		AUTHENTICATION_FAILED: {
 			value: {
 				error: {
-					message:
-						"Authentication failed. Please ensure your token is correct.",
+					message: "Authentication failed.",
 					code: "AUTHENTICATION_FAILED",
 					id: "b0a7f5f8-dc2f-4171-b91f-de88ad238e14",
 				},
@@ -38,7 +37,7 @@ export const errors = {
 			value: {
 				error: {
 					message:
-						"You sent a request to Calc, Calckey's resident stoner furry, instead of the server.",
+						"You sent a request to Calc instead of the server. How did this happen?",
 					code: "I_AM_CALC",
 					id: "60c46cd1-f23a-46b1-bebe-5d2b73951a84",
 				},