Length of time for interview
I'm trying to figure out how to best calculate the length of time for individual interviews in wave 8. It looks like in h_indresp_ip, there are variables for start time:
h_indstimehh individual interview start time (hours)
h_indstimemm individual interview start time (minutes)
h_indstimess individual interview start time (seconds)
But then there is no corresponding data for the end time. How can I compute the length of time for each interview? Or maybe this variable already exists?
Please let me know when you have a chance.