Addy has been using her stander every day since we got it.  She's supposed to do no more than 30 minutes at a time and aim for a total of 60 throughout the day.  So far we've gotten all 60 minutes in each day (we do 15-20 minute sessions for now).  It seems to be quite a workout for Addy because she is definitely eating and sleeping more than she did a week ago.