How quickly, assuming the volume and open interest is reasonably high, would I most likely be able to buy or sell a contract? Like, would it be as quickly as if I were buying or selling the underlying stock? Or would I have an open order for days. And if the option reaches expiration, and it is ITM, is it guaranteed to be sold at, at least, the intrinsic value? Also, how close to the latest current bid price and ask price would you probably be able to buy or sell you option?