Deleted email retention period

...  I didn’t see any options under settings related to deleted storage preference ...

If you're asking about Comcast's webmail at https://connect.xfinity.com, there are no settings for delete interval.

Messages in all folders except Spam and Trash (and any folders created within those) should remain indefinitely unless a person or program removes them. Please see https://www.xfinity.com/support/articles/set-email-deletion-settings. In addition, Email Expert @Latoque and Employee @XfinityGabrielS have posted:

• Spam is stored for 7 days or 5,000 messages, whichever comes first
• Trash is stored for 14 days or 5,000 messages, whichever comes first
• Messages deleted from Spam and Trash are moved to the hidden Recovery folder and are kept there for 30 days after being moved there, or until the folder contains 15,000 messages, whichever comes first. During this time messages can be recovered (see https://connect.xfinity.com/appsuite/apps/faq/index.html#recoverEmail) and do not count against the 10GB mailbox limit
• Messages in the remaining folders are kept indefinitely
• If the 10GB mailbox limit is exceeded, new messages are not accepted
• Users cannot change these settings

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