How much time should it take someone to bench press 140kgs if they can bench press 60kgs now?
user
This can be hard to predict because I don't have any data about where this individual is starting. However, as an average, an intermediate lifter could expect to add roughly 23 to 25 kg to their bench press in a year given sufficient training. Given that you are asking about an increase of 80 kg, you could expect that to take 3-4 years. Do note that "newbie gains" typically wear off and it will become progressively harder to increase strength in a linear way.
assistant