I have three children aged nine , three and 20 months. With my eldest daughter , I was in labour for fourteen and a half hours , with my second daughter I was in labour for thirteen and a half hours and with my son , I was in labour for seven hours. Although it is generally thought that a second or subsequent pregnancy is quicker , it is not always neccessarily the case. It really varies from woman to woman. They do say though that because the birth canal has already been opened , then a second or subsequent pregnancy may be quicker. It's not been the first time when a woman has been caught short thinking that she had plenty of time , only for her labour to progress really quickly and that was really quick for a first labour for you.
The best advice I can give you is to make sure that you have your hospital bag packed well in advance so that if you need to go in a hurry you are prepared. Don't leave it to your birthing partner because you will know exactly what you need but they will most likely forget your essentials lol ! Good luck when the time comes x