Unit of TIME in dbms_xplan

I am 10.2.0.3 on HP UNIX 11i

I use sqlplus to run a query. I set set autotrace on which I think calls dbms_xplan to display the sql plan. Query took 54 seconds to complete (using UNIX time x command).

Plan (only few lines are shown), times are lot more. I do not understand TIME for each operation. Is it in HH:MI:SS format. How can time of several operations (00:01:58) – 118 seconds be larger than total execution time of the query.

| Id | Operation | Name
| Rows |

Bytes |TempSpc| Cost (%CPU)| Time |

| 0 | SELECT STATEMENT |
| 74646 |

 9622K| | 9751 (2)| 00:01:58 |

| 1 | SORT ORDER BY |
| 74646 |

 9622K| 20M| 9751 (2)| 00:01:58 |

| 2 | HASH UNIQUE |
| 74646 |

 9622K| 20M| 7543 (2)| 00:01:31 |

| 3 | NESTED LOOPS |
| 74646 |

 9622K| | 5335 (2)| 00:01:05 |

| 4 | NESTED LOOPS |
| 212K|

   23M| | 5318 (2)| 00:01:04 |

|*  5 |      HASH JOIN                   |

   19M| 4688K| 5301 (2)| 00:01:04 | Received on Sat Dec 27 2008 - 12:25:30 CST