I've never heard or seen something like this. IMHO a column of a resultset of a query isn't qualified for a value like this because each row in a resultset would have another duration. In fact the execution time is a single value that has no place in the result set of a query.
No, you're never too old to Yak'n'Roll if you're too young to die.
You can do the following.Before your actual query declare a variable of datatype datetime say @dt and set its value to getdate().after the actual query statement you can write something like this
INSERT query execution time
Posted - 11/07/2010 : 07:09:51
