>>11518306Scott Kelly wrote about this in his autobiography. It depends on the person. Most people go up have an initial period of sickness and acclimatise within a few hours certainly a few days. Remember most astronauts before the ISS were only in microgravity for a few days or a little over a week max. Yes there was other station but alot less station astronauts.
An interesting passage to me was how some astronauts feel a sense of microgravity being how its supposed to be an never fully acclimatising to 1g again.