It varies by person so there's no telling. Most feel better by 2nd tri, but last time I had it for 9 months. Here are some things to try:
-sea bands to wear on your wrists
-eat small frequent meals
-oatmeal, dry toast, saltines, or a dozen other miracle foods people suggested to me
-if it gets bad, talk to your doc about medication
ETA:
-anything ginger
-suck on hard candy or over priced preggie pops