Millisecond Forums

Hey guys!

I'm having some trouble while programming a task in Inquisit 4.
Participants have to complete a survey; they have 13 question, 10 minutes time to solve them, they can scroll through the questions and end the survey whenever they want (finish button).
I already have a timer showing the elapsed time to participants:

<clock timer_survey>
/ mode = timer
/ erase = false
/resetrate = experiment
/ txcolor = yellow
/ txbgcolor = black
/ timeout = 600000
/ position = (90%, 7%)
/ format = "mm:ss"
</clock>

So what I need (and what the timer displays) is the total time they spend on the survey. Now I am trying to record this time in some variables,
but somehow the elapsedtime expression does not work...

This might be stupid but I tried:

<expressions>
/ LRT_time = clock.timer_survey.elapsedtime
</expressions>

and then 

<data>
/file = "MC_new_LRT.iqdat"
/separatefiles = true
/ columns = [expressions.LRT_time]
</data>

Somehow, this does not work but I figure there has to be a pretty easy way, since i already have the timer giving me the right data...

Can someone maybe help me out?

Thanks so much,
Nora