Not sure if I would for for 30 or 60min for my first meet.
Personally, I did an hour for my very first meet....it was all over in about 15mins, but I found the time I spent chatting afterwards really helped me for future punts.
I just found it easier to be myself after the event. I told her how nervous I had been etc, and a lot of what she told me helped me to relax the next time.
All experience is good experience one way or another.
Everyone is different, but I'd go for an hour.....she'll help you to pop twice if you've got it in you
(sadly I don't think I have any more myself
....)
Don't think about it anymore...do it! you will thank me afterwards I guarantee it!!