Does nvarchar(max) only allow 4000 characters?

Question

In the query below nvarchar(max) seems to truncate at 4000 characters. That seems contrary to the answer here which says "Since NVARCHAR uses 2 bytes per character, that's approx. 1 billion characters."

DECLARE @test NVARCHAR(MAX)
DECLARE @i INT
SET @i=0
set @test=cast('x' as nvarchar(max))

while(@i<6000)
begin
set @test= (@test+ cast('x' as nvarchar(max)))
set @i=@i+1

end

print @TEST--has only 4000 characters

Answer 1

Sorry, just found out that this is a limitation of the message screen in Sql server management studio. The code below shows correct results

DECLARE @test NVARCHAR(MAX)
DECLARE @i INT
SET @i=0
set @test=cast('x' as nvarchar(max))

while(@i<6000)
begin
set @test= (@test+ cast('x' as nvarchar(max)))
set @i=@i+1

end

print len(@TEST)--6001