Deleting rows with time 55 minutes less than max time - Mailing list pgsql-sql

I have a table which contains a single datetime column along with other
columns. Now I want to delete all the rows with datetime values 55
minutes less(in the datetime column) than the maximum datetime value
present in the datetime column. How do I achieve this? I have tried all
possibile methods which I know of. Still could not achieve this.
Thanks in advance.

regards
Imitaz