In short, probably at least 2-3 months. The training you impose on your body is known as a stimulus and your body’s response is an adaptation. You have to consistently impose this stimulus for some time before the body adapts to better deal with the stimulus AKA get stronger and bigger. There are ways to get stronger without increasing muscle size and your body will utilize those ways in the initial stages of adaptation. Don’t get discouraged when you don’t see results right away. Significant gains can take a long time to achieve and optimizing your entire lifestyle is a huge component to accelerating and maximizing gains.