it varies,it's different for all of us,also depends on how much you are on your feet standing/walking,
you can try an anti-inflammatory like Aleve or some form of Naproxen,
and maybe try ice packing it,
and sit down more and elevate your leg,treat it like any other injury to your leg,
length of swelling ? my hands swelled after the tattoo for just a few days.but like I said it will vary from person to person.