declare @text nvarchar(max),
@i int
set @text = 'skdjfnaslkjdfnasdlkjfnsadlkfjnaskldfjnaskldfjnasdklfjnasdflkjasdnfskdjfnaslkjdfnasdlkjfnsadlkfjnaskldfjnaskldfjnasdklfjnasdflkjasdnf'
set @i = 1
select len(@text) as [start]
while @i < 10
BEGIN
set @text = @text + @text
set @i= @i + 1
END
select len(@text) as [end]
select cast(@text as xml) as [end]