MaxDiff Interview Duration

Question

Aside from Exhibit 9 in this technical paper https://www.sawtoothsoftware.com/download/techpap/amaxdiff.pdf  ....

Is there any information you can provide on the interview duration of MaxDiff?  Perhaps looking at difference between 4 and 5 # items/set?  

Thanks!

Answer 1

You can create one free format question on very first page of maxdiff excercise.
<input name="time1_r1" id="time1_r1" type="hidden" value="[%SystemTime()%]">
and one at last page of maxdiff.
<input name="time2_r1" id="time2_r1" type="hidden" value="[%SystemTime()%]">

Now you need to create one more free format page which can be calculate time.

<input name="time_r1" id="time_r1" type="hidden" value="[%Begin Unverified Perl
my $a=(VALUE('time2_r1')-VALUE('time1_r1'))/60;
return $a;
End Unverified%]">