diff --git a/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.spec.ts b/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.spec.ts
new file mode 100644
index 000000000000..c5095b6a8b48
--- /dev/null
+++ b/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.spec.ts
@@ -0,0 +1,95 @@
+import { describe, it, expect } from 'vitest';
+import {
+  fromISO8601,
+  toISO8601,
+  isValidISO8601,
+  convertDuration,
+} from './iso8601DurationHelper';
+
+describe('iso8601DurationHelper', () => {
+  describe('fromISO8601', () => {
+    it('parses days', () => {
+      expect(fromISO8601('P8D')).toEqual({ value: 8, unit: 'D' });
+    });
+
+    it('parses months', () => {
+      expect(fromISO8601('P6M')).toEqual({ value: 6, unit: 'M' });
+    });
+
+    it('parses years', () => {
+      expect(fromISO8601('P1Y')).toEqual({ value: 1, unit: 'Y' });
+    });
+
+    // Regression: a 7-day retention is serialized as the ISO 8601 week form
+    // 'P1W' and previously fell back to the default '1 year' value.
+    it('normalizes weeks to days', () => {
+      expect(fromISO8601('P1W')).toEqual({ value: 7, unit: 'D' });
+      expect(fromISO8601('P3W')).toEqual({ value: 21, unit: 'D' });
+    });
+
+    it('returns the default value when period is missing', () => {
+      expect(fromISO8601()).toEqual({ value: 1, unit: 'Y' });
+    });
+
+    it('returns the default value when period is invalid', () => {
+      expect(fromISO8601('invalid')).toEqual({ value: 1, unit: 'Y' });
+    });
+
+    it('honors a custom default value', () => {
+      expect(fromISO8601(undefined, { value: 30, unit: 'D' })).toEqual({
+        value: 30,
+        unit: 'D',
+      });
+    });
+  });
+
+  describe('toISO8601', () => {
+    it('serializes a duration', () => {
+      expect(toISO8601(7, 'D')).toBe('P7D');
+      expect(toISO8601(1, 'Y')).toBe('P1Y');
+    });
+
+    it('throws for non-positive or non-integer values', () => {
+      expect(() => toISO8601(0, 'D')).toThrow();
+      expect(() => toISO8601(-1, 'Y')).toThrow();
+      expect(() => toISO8601(1.5, 'M')).toThrow();
+    });
+  });
+
+  describe('isValidISO8601', () => {
+    it('accepts days, weeks, months and years', () => {
+      expect(isValidISO8601('P7D')).toBe(true);
+      expect(isValidISO8601('P1W')).toBe(true);
+      expect(isValidISO8601('P6M')).toBe(true);
+      expect(isValidISO8601('P1Y')).toBe(true);
+    });
+
+    it('rejects invalid input', () => {
+      expect(isValidISO8601('invalid')).toBe(false);
+      expect(isValidISO8601('P1H')).toBe(false);
+    });
+  });
+
+  describe('convertDuration', () => {
+    it('converts years to days', () => {
+      expect(convertDuration({ value: 1, unit: 'Y' }, 'D')).toEqual({
+        value: 365,
+        unit: 'D',
+      });
+    });
+
+    it('converts days to months', () => {
+      expect(convertDuration({ value: 30, unit: 'D' }, 'M')).toEqual({
+        value: 1,
+        unit: 'M',
+      });
+    });
+
+    it('returns the same duration when units match', () => {
+      expect(convertDuration({ value: 7, unit: 'D' }, 'D')).toEqual({
+        value: 7,
+        unit: 'D',
+      });
+    });
+  });
+});
diff --git a/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.ts b/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.ts
index 2ad6a145720b..fa4a9b713bf8 100644
--- a/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.ts
+++ b/packages/manager/apps/pci-object-storage/src/lib/iso8601DurationHelper.ts
@@ -13,13 +13,15 @@ export interface Duration {
 
 /**
  * Converts an ISO 8601 duration string to a value and unit object
- * Supports Days (D), Months (M), and Years (Y)
- * @param period - ISO 8601 duration string (e.g., 'P1Y', 'P30D', 'P6M')
+ * Supports Days (D), Weeks (W), Months (M), and Years (Y).
+ * Weeks are normalized to days (1W = 7D) since week is not a display unit.
+ * @param period - ISO 8601 duration string (e.g., 'P1Y', 'P30D', 'P6M', 'P1W')
  * @param defaultValue - Default duration to return if parsing fails (defaults to { value: 1, unit: 'Y' })
  * @returns Object with value and unit
  * @example
  * fromISO8601('P1Y') // { value: 1, unit: 'Y' }
  * fromISO8601('P30D') // { value: 30, unit: 'D' }
+ * fromISO8601('P1W') // { value: 7, unit: 'D' }
  * fromISO8601('invalid') // { value: 1, unit: 'Y' }
  */
 export const fromISO8601 = (
@@ -27,11 +29,18 @@ export const fromISO8601 = (
   defaultValue: Duration = { value: 1, unit: 'Y' },
 ): Duration => {
   if (!period) return defaultValue;
-  const match = period.match(/^P(\d+)([DMY])$/);
+  const match = period.match(/^P(\d+)([DWMY])$/);
   if (!match) return defaultValue;
 
+  const value = parseInt(match[1], 10);
+  // ISO 8601 represents an exact number of weeks (e.g. 7 days as 'P1W').
+  // Normalize to days since weeks are not a supported display unit.
+  if (match[2] === 'W') {
+    return { value: value * 7, unit: 'D' };
+  }
+
   const unit = match[2] as DurationUnit;
-  return { value: parseInt(match[1], 10), unit };
+  return { value, unit };
 };
 
 /**
@@ -58,10 +67,11 @@ export const toISO8601 = (value: number, unit: DurationUnit): string => {
  * @example
  * isValidISO8601('P1Y') // true
  * isValidISO8601('P30D') // true
+ * isValidISO8601('P1W') // true
  * isValidISO8601('invalid') // false
  */
 export const isValidISO8601 = (period: string): boolean => {
-  return /^P(\d+)([DMY])$/.test(period);
+  return /^P(\d+)([DWMY])$/.test(period);
 };
 
 /**