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Indexes on 40 Billion record table

Hi guys, I have a heap table with 40 billion records and its on the grain of Item,store,week. The table is partitioned on week and has a total of 104 weeks. I need to create a clustered index on Item,store week. What is the best option to go about it ? What would be the approx time for index creation on this dataset ? Will partition switching from a heap table ( Table a) to a truncated index created table ( table b) help in any way? or would it eventually result in fragmentation.

indexesperformance-tuning
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Schema for the table? If there are other fields, it might complicate issues.

What version (& edition) of SQL Server are you on?

What's the usage pattern for this table?

What's the underlying hardware / storage? How much memory?

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