The necessary and sufficient length of the neck strap is 68cm. I think this is the optimal length when specializing in shooting only. This length is enough when holding the camera, whether it is vertical or horizontal. It seems to be a modern shooter that checks photos on the back monitor with a compact mirrorless machine that focuses on shooting like M -type Leica and does not check monitors, etc. on the back monitor. I don't think a long strap is needed.
