In Alfred Hitchcock's "Psycho", roughly how far into the film is it before Janet Leigh is killed in the shower scene?

In the next scene, the classic, brutal shower murder scene, an unexplainable, unpremeditated, and irrational murder, the major star of the film - Marion - is shockingly stabbed to death after the first 47 minutes of the film's start. It is the most famous murder scene ever filmed and one of the most jarring. It took a full week to complete, using fast-cut editing of 78 pieces of film, 70 camera setups, and a naked stand-in model (Marli Renfro) in a 45-second impressionistic montage sequence, and inter-cutting slow-motion and regular speed footage.