Temporary Tablespace Sizing in Oracle for SAP

Hi All,

I require a small clarification on , how to size Temporary Tablepace for SAP ECC systems below are the current details,

DB size                          :- 1 TB

Business Tablespace      :- 70 GB free

Temporary Tablepspace   :- 2 GB

What is the calculation required to create Temp TableSpace sizde in SAP.

Kindly give your thoughts on this.

Thanks

Pradeep.