You might want to take into consideration the type of tree that you are using if you are trying to set up a windbreak.  Often people will choose varieties that are listed as rapid growers.  Rapid growing trees, in proper growing conditions, can grow 2 or more feet a year.  These are often chosen for the fast results.  Examples include the hybrid poplar (Populus deltoides / Populus nigra), the arborvitae green giant (Thuja plicata 'Green Giant'), and the silver maple (Acer saccharinum)                                         

There are many rapid growing trees to choose from, and there are many that are beautiful to look at.  Often fast growers are chosen to fill in newly developing areas for the results.  They are great for this purpose.  The downside is that generally the faster growing trees have a softer wood.  In the case of trying to create a windbreak, they will be more susceptible to loosing their branches in high winds and storms.  Choosing a tree that is know for having hard wood would be the way to remedy the issue, but often they take longer to get established. 

The question then becomes, which do you choose?  That is going to be up to you.  For those wanting more instant results (at least instant in the plant world) may want to stick to a rapid grower.  If you have time, and would prefer stronger trees then a slow grower might be the way to go.  It is something to consider when making your choice.