Emails that you have deleted from the Inbox folder will be in the trash for a maximum of 30 days on Gmail. If you delete the emails from the Trash folder here to know how to recover emails from gmail , it is difficult to retrieve it. To recover deleted emails, go to Trash, select the email to be recovered, and click the Move to Inbox option. To prevent any data loss, backup Gmail data to your local drive. In some other email applications, the deleted email is stored only for 12 to 14 days in the Trash folder.