[AM] Database "refactoring" effort question

Here is a question for you

END OF LAST ITERATION
We have a database system for processing tax statements and revenue from tax
papers.
The database well encapsulated, hidden from applications behind "views".
We have a test database containing data for 1,000 taxpayers
We have a regression test suite that will, at the push of a button
- push each table through its life cycle from creation through state changes
to archive
- navigate each relationship.
We have a production database containing data for 10 million taxpayers,

CHANGE REQUEST TO BE PROCESSED IN NEXT ITERATION
In the kernel entity - the Taxpayer table. 
Please replace the column Taxpayer Name (40 characters)
by two columns Taxpayer ForeName (25 characters) and Taxpayer Surname (25
characters).

THE QUESTION
How long will it take make this small change
- to the test database?
- to the production database?

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