sql - Average difference between two datetime columns -

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i want find average time each customer spent on form.

the table looks this:

customerid | intime | outtime

gives average duration in seconds - group id , use aggregate avg function 

create table #test (     customerid int,     intime datetime,      outtime datetime )      insert #test values (1,'20140101 10:00','20140101 12:00'),                          (1,'20140102 10:00','20140102 12:00'),                          (2,'20140101 10:00','20140101 20:00'),                          (3,'20140103 10:00','20140103 11:00')      select customerid, avg(datediff(ss,intime,outtime)) #test group customerid  drop table #test

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