I know it takes a lot of time
Um, after a lot of time
Really it'll depend on too many variables to say. Not to mention that you could get into LONG discussions here as to what constitutes "results". Do you want to be martially effective? Do you want to be a calmer person? Do you want better fitness? Do you want to be less clumsy? Blah, blah, blah, etc. etc.
My advice (which ain't worth much) is to just go to class and do what the teacher is showing to the best of your ability at that time. If you are having a rough and tumble class then come out physically exhausetd. If the teacher wants to sit and talk aikido history/philosophy that night then come out mentally exhausted. But whatever you are doing in class DO it with everything that you are and don't worry about the end results...they'll happen on their own.