Step 1. User A provide access to User B through calendar Delegation. ( In my Case Nilesh provided read access to me)
Step 2. User B Added user A calendar in his notes client. Click Add calendar option on left hand side-> Select Notes Application Calendar-> Give a Lebel like I have given Nilesh in below screen shot.-> Browse to Nilesh mailbox by clicking Lookup.-> Check the box "View this calendar when Offline or on a mobile Device" option.-> Select 12 months in "When offline, Show "
Step 3. You will notice that user B calendar is visible in notes client.
Calendar Entries for 30th December 2019 and 1st January 2020.
Step 4. Now open user B mailbox / Calendar via inotes. You will notice that calendar entries are visible till November 2019 only, Although User A has selected to view 12 months calendar entries while adding user B calendar.
Please note i have not done any setting in inotes. Calendar entries will be visible in inotes for 6 month if you add calendar in notes client with above mentioned steps.