Storing 6 millions values in SQL server columns

Hi,

How many values (size) I can store in single SQL server column.

My Scenario,

Column1    Column2      Column3

     1     ABC     1,2,3,........(6 millions values)  

     2     CDE     1,2,3,.......(6 millions values)  

and problem is that I can't store them in rows. I need to store them in single column with comma separated.

What would be the best way to store them and retrieve them faster. I am thinking about converting it to byte[] or something but not sure how much time it will take to convert to byte and  then again to text.