How to reduce time for gather statistics for a table.

I have a table size 520 gb
Its one of the partition size is 38 gb
and total indexes of related table is 412 gb.
Server/instance details.
==========
56 cpu -> Hyper threading enable
280 gb ram
35 gb sga
27 gb buffer cache
4.5 gb shared pool size
25 gb pga
undo size 90gb
temp size 150 gb
Details :
exec dbms_stats.gather_table_stats('OWNER','TAB_NAME',PARTNAME=>'PART_NAME',CASCADE=>FALSE,ESTIMATE_PERCENT=>10,DEGREE=>30,NO_INVALIDATE=>TRUE);
when i am firing this in an ideal time when there is no load that time also is is taking 28 mins to complete.
Can anybody please reply me how can we reduce the stats gather time.
Thanks in advance,
Tapas Karmakar
Oracle DBA.

Enable tracing to see where the time is going.
parallel 30 seems optimistic - unless you have a large number of discs to support the I/O ?
you haven't limited histogram collection, and most of the time spent of histograms may be wasted time - what histograms do you really need, and how many does Oracle analyse for and then discard ?
Using a block sample may help slightly
You haven't limited the granularity of the stats collection to the partition - the default is partition plus table, so I think you're also doing a massive sample on the table after completing the partition. Is this what you want to do, or do you have an alternative strategy for generating table-level stats.
Regards
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For example there is a table T1 with 25GB size (3 crores rows) and partitioned when i try generating statistics for a T1 table with below command it takes lots of time and i dont know what is the progress.
>
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