There is no honest finish date. You can make meaningful progress quickly, but reliable acting takes repeated practice across different material, partners, pressures, and kinds of direction.
A better measure is what you can do consistently. Can you read a new scene and identify the important facts? Can you choose what you want from the other person? Can you stay present when they do something unexpected? Can you take a note and deliver another take without throwing away all your preparation? Those abilities develop at different speeds. Count useful repetitions, not years spent near acting. One focused year can teach more than several years of repeating the same habits. Keep asking a practical question: what can I do now that I could not do six months ago, and what still falls apart under pressure?