diff --git a/src/utils/queryDayLimit.js b/src/utils/queryDayLimit.js
new file mode 100644
index 0000000..7b8edaf
--- /dev/null
+++ b/src/utils/queryDayLimit.js
@@ -0,0 +1,83 @@
+import { getConfigKey } from "@/api/system/config";
+
+const QUERY_DAY_LIMIT_CONFIG_KEY = "b_side_query_day_limit_config";
+
+let cachedLimitDays = null;
+let loadingPromise = null;
+
+function hasConfigValue(value) {
+  if (value === undefined || value === null) {
+    return false;
+  }
+  if (typeof value === "string" && !value.trim()) {
+    return false;
+  }
+  return true;
+}
+
+function parseLimitDays(configValue) {
+  if (configValue === undefined || configValue === null || configValue === "") {
+    return null;
+  }
+
+  let parsedValue = configValue;
+  // Handle nested JSON strings, e.g. "\"{\\\"limitDays\\\":5}\""
+  for (let i = 0; i < 2; i += 1) {
+    if (typeof parsedValue !== "string") {
+      break;
+    }
+    const text = parsedValue.trim();
+    if (!text) {
+      return null;
+    }
+    try {
+      parsedValue = JSON.parse(text);
+    } catch (error) {
+      // Plain numeric string is also supported.
+      const numericDays = Number(text);
+      if (Number.isFinite(numericDays)) {
+        return numericDays > 0 ? Math.floor(numericDays) : null;
+      }
+      return null;
+    }
+  }
+
+  if (parsedValue && typeof parsedValue === "object" && "configValue" in parsedValue) {
+    return parseLimitDays(parsedValue.configValue);
+  }
+
+  const days = Number(parsedValue && parsedValue.limitDays);
+  if (!Number.isFinite(days) || days <= 0) {
+    return null;
+  }
+  return Math.floor(days);
+}
+
+export async function getQueryDayLimitDays() {
+  if (cachedLimitDays !== null) {
+    return cachedLimitDays;
+  }
+  if (loadingPromise) {
+    return loadingPromise;
+  }
+
+  loadingPromise = getConfigKey(QUERY_DAY_LIMIT_CONFIG_KEY)
+    .then((response) => {
+      const configValue = hasConfigValue(response && response.data)
+        ? response.data
+        : response && response.msg;
+      const limitDays = parseLimitDays(configValue);
+      if (Number.isFinite(limitDays) && limitDays > 0) {
+        cachedLimitDays = limitDays;
+      }
+      return limitDays;
+    })
+    .catch(() => {
+      return null;
+    })
+    .finally(() => {
+      loadingPromise = null;
+    });
+
+  return loadingPromise;
+}