Increase size of columns MS SQL server 2012

I need to increase size of a nvarchar column  from 2000 to 4000. Of course it will time out. How to avoid this? Should I shut down the website at this time?
Ian WhiteOwner and FounderAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
if you are trying to do this from the GUI directly, yes it may time out because it does not do the efficient way.

do it with simple transact sql:
https://msdn.microsoft.com/en-us/library/ms190273.aspx

ALTER TABLE yourtable  ALTER COLUMN column_name nVARCHAR(4000)

that should do it
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Do what angellll said but put the command inside a job and schedule it to run at 03:00AM or another time that you know won't impact the system and users.
There's no need for shutdown the website.
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Ian WhiteOwner and FounderAuthor Commented:
Thank you for your help
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