The Recycle Bin link in the sidebar of Salesforce.com lets you to view and restore recently deleted records for 15 days before they are permanently deleted. Your Recycle Bin record limit is 25 times the Megabytes (MBs) in your storage. For example, if your organization has 2 GB of storage then your limit is 25 times 2000 MB or 50,000 records. If your organization reaches its Recycle Bin limit, Salesforce automatically removes the oldest records if they have been in the Recycle Bin for at least two hours.

 

Recycle Bin Usage in Salesforce Lightning 

https://www.infallibletechie.com/2021/01/recycle-bin-usage-in-salesforce.html

Note:
1. Records in the Recycle Bin don’t count against your org’s storage usage.

2. After 15 days, the records will be permanently deleted. So, in order to retrieve data deleted after 15 days, kindly contact Salesforce.com support.