With the right diet and workout routine, you may be able to get one in a month.
Work out 6 days of the week for 45 minutes each day.
doing exercises that work out your abs and core,
reducing the amount of body fat you carry around your core as much as possible.
If you’re a man, aim for a body fat percentage of 6-13%. Calculate: https://bmi-calories.com/body-fat-percentage-calculator.html
Do exercises that will build your rectus abdominis muscle (muscle responsible for the appearance of a six pack) like: Crunches, Weighted Sit-Ups
Also do: wall push-ups