Hi,
My son had night terrors starting on a trip. (He wasn't in his crib/bed, but somewhere new. The night terrors were always worse on a trip.) I hate to tell you how long they lasted for us...over a year. However, I did FINALLY find something that worked well. According to Dr. Marc Weissbluth's book, Healthy Sleep Habits, Happy Child, night terrors occur most often when a child is overtired. One of the methods he recommended was to put the child to sleep 30 minutes earlier than normal. This changes the sleep cycle which helps interrupt the night terror sequence. THIS SIMPLE STEP WORKED FOR US! It was a sacrifice of sorts to put him to bed so much earlier. There were events we had to come home from earlier than we would have wanted, nights when my husband worked late that he didn't get to play with my son, and people thought we were strange to be so rigid about his nap and bed times etc., but it was SO WORTH IT to get rid of those night terrors. I was a walking zombie for YEARS thanks to his night terrors that started and lasted all during my pregnancy with my daughter and then continued on during her newborn/baby stages. I would just get her down again and be asleep when he would wake me up with a night terror. It was brutal. I totally get why sleep deprivation is a tactic used during prisoner interrogations. Anyway, check the above mentioned book out of the library or Barnes and Noble, etc. Make sure it is at least the 3rd edition. Pages 378-379 specifically mention sleep terrors. (The earlier editions don't mention night terrors.) His book is pretty clinical, and he does advocate the "let them cry" approach more than I could handle, but he cured our night terrors. It is good reference material to have on hand. Dr. Weissbluth has been on Oprah and talked about the importance of children getting the amount of sleep they really need...a lot more than they often get.
Hope this helps!
Holly