Actually that depends on if your looking at the results in a table or if you are looking at them from the Profiler UI. If it's the UI then it is milliseconds.
"Beginning with SQL Server 2005, the server reports the duration of an event in microseconds (one millionth, or 10-6, of a second) and the amount of CPU time used by the event in milliseconds (one thousandth, or 10-3, of a second). In SQL Server 2000, the server reported both duration and CPU time in milliseconds. In SQL Server 2005 and later, the SQL Server Profiler graphical user interface displays the Duration column in milliseconds by default, but when a trace is saved to either a file or a database table, the Duration column value is written in microseconds." http://msdn.microsoft.com/en-us/library/ms175848.aspx
How many indexes are there and how many columns are there in the associated indexes. What is the execution plan for this query?