Rachel I'm in exactly the same boat. I'm 38 weeks pg with #2 and have been wondering about my second labour. Tan32 you have scared the crap out of me. My first was 3 1/2 hours and I am worried my second is going to be a rocket. I matched my mum's first labour to the minute (even the same length stages) and her second labour was natural and 1 1/2 hrs. I'm really thankful I live really close to the hospital. I'm thinking I might be a bit quick this time but Tan32 you don't mess around, LOL!! Rachel as a rule of thumb (never forget there are exceptions to every rule) that the second is quicker and easier because your body knows what it is doing this time and dilates and effaces at the same time and 2nd stage is quicker as the path is paved so to speak. Fingers crossed your have an amazing birth.
Going to keep a close eye on this thread.