Availability Group - how much data was lost after forced failover

Let's consider a SQL Server AlwaysOn cluster with two nodes in asynchronous replication.

Is there any way to calculate how much data was lost after forced failover?

I mean in terms of time, to be able to know "I lost 1 hour of data or 1 minute".
I have considered checking LSNs but I don't know how to translate them into datetime.

• Go to SSMS

• Object Explorer

• Expand Always On High Availability

• Expand Availability Groups

• Right click your AG

• Select Show Dashboard

In the dashboard, above the list of AG databases and their status, there is Add/Remove Columns button

Pick Estimated Data Loss (time) and add this column to dashboard

You will be able to see the estimated data loss time for each DB

You can check this dashboard right before you are going to do forced failover, to get the idea of how much data can be lost

StackExchange Database Administrators Q#279449, answer score: 10