How to log quires which are taking time in PostgreSQL 9.1.

Dear expert,

I want to log only that queries which are taking around 5 minutes to execute.
I have a database size >1.5T and using PostgreSQL 9.1 with Linux OS.

Thanks in advance.

Regards,
Dinesh Chandra
|Database administrator (Oracle/PostgreSQL)| Cyient Ltd. Noida.
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