How could I Check Exchange Database Last Backup Time?

Hi

Our Company are using Exchange 2010, the Administrator did databases Backup at a fixed time every week, occasionally some database might be miss for backup by mistake or the database was currently using. 

So is there a way to have a report to show the length of time from the Mailbox Database Last Full Backup. For example

Databases         Backups (Hrs Ago)

DB1                        10H

DB2                    9H

DB3                        N/A

I have Check the command Get-MailboxDatabase, it only got the Parameter Called LastFullBackup, and it is store by time.  How Can I change it to the Hours

Thank for any Help

Jeanet Singh