diff --git a/src/api/exchange/_methods/twapOrder.ts b/src/api/exchange/_methods/twapOrder.ts
index 695b9ed1..f2ba28f2 100644
--- a/src/api/exchange/_methods/twapOrder.ts
+++ b/src/api/exchange/_methods/twapOrder.ts
@@ -27,7 +27,7 @@ export const TwapOrderRequest = /* @__PURE__ */ (() => {
         /** Whether the order is reduce-only. */
         r: v.boolean(),
         /** TWAP duration in minutes. */
-        m: v.pipe(UnsignedInteger, v.minValue(5), v.maxValue(1440)),
+        m: v.pipe(UnsignedInteger, v.minValue(5), v.maxValue(10080)), // 5 minutes to 7 days
         /** Enable random order timing. */
         t: v.boolean(),
       }),
diff --git a/tests/api/exchange/twapOrder.test.ts b/tests/api/exchange/twapOrder.test.ts
index d36831e1..39f1079b 100644
--- a/tests/api/exchange/twapOrder.test.ts
+++ b/tests/api/exchange/twapOrder.test.ts
@@ -1,3 +1,4 @@
+import { assertEquals } from "jsr:@std/assert@1";
 import { type TwapOrderParameters, TwapOrderRequest } from "@nktkas/hyperliquid/api/exchange";
 import { formatPrice, formatSize } from "@nktkas/hyperliquid/utils";
 import * as v from "@valibot/valibot";
@@ -44,3 +45,14 @@ runTest({
     schemaCoverage(responseSchema, data);
   },
 });
+
+Deno.test("twapOrder: duration bounds (5 minutes to 7 days)", () => {
+  const twapSchema = TwapOrderRequest.entries.action.entries.twap;
+  const twap = { a: 0, b: true, s: "1", r: false, t: false };
+  for (const m of [5, 1440, 1441, 10080]) {
+    assertEquals(v.safeParse(twapSchema, { ...twap, m }).success, true, `m=${m} should be accepted`);
+  }
+  for (const m of [4, 10081]) {
+    assertEquals(v.safeParse(twapSchema, { ...twap, m }).success, false, `m=${m} should be rejected`);
+  }
+});