you cannot exercise a European style option- they are usually cash settled anyway, but you can sell or buy them all day long -I trade UK options on the ftse index and sometimes take swing trades for 3-7 days-you can do whatever you like with zero risk of assignment or exercise-no idea why people trade stock options-you really need to be right on those puppies and most people fool themselves into thinking they are doing ok- there are only a few share options traded in the UK -it's a loser's game as sooner or later you get destroyed because the company lied about its profits