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As far as I know, there's no reliable way to know how long you're going to be in labor before you actually start going into labor. If it's possible, you can ask your mom how long she was in labor, as I understand it's a good indication of how long you'll be in labor, but it's not a guarantee of anything.
There's no way to tell how long you'll be in labor. It's different for every woman and different for each pregnancy. Things like epidurals and being induced affect what your body does naturally and will have a big effect on the amount of time you're in labor. It also depends on your baby's position, "face up" can take longer to come out than "face down", and different breech positions affect things too. The size of the birth canal and size of the baby also affect how long you have to push.You'll just have to be patient and wait and see what happens.