To access this feature, you will need to go to the Setting's page by clicking the menu item button located at the right side of your Breaking Mars page.

Withdrawal on the days you choose

When you click on it you'll see the Auto Withdrawals option below. You will be able to select from 7, 14, 21, 30, 60, or 90 days to automatically withdraw unanswered pending connection requests.

When clicking 'Save' you'll be seeing the notification below option 'Auto withdrawal interval updated'.