43 Inches, the training scenarios you describe no longer exist - limited by those who let their ambitions override their capabilities, and the subsequent caution by insurance companies.
PA31s have not changed in 50 years…..but training standards have. The result is that - in my opinion - a PA31 is now not an aircraft for a low time pilot.
Out of curiosity, when was the last time you flew a PA31 in commercial ops?