>>Is there any benefit by vac hanging seldom, such as once per week? Or does it require more consistent usage to make it worthwhile? I’m sure this is subjective to a degree.<<
Yes, you would definitely keep the anatomy conditioned even with once weekly sessions for increased vascularity, tone and erectile quality. It is up to the individual to experiment to see what sort of results are possible with various workout routines. By the same token over-training can lead to a loss of erectile quality and this is one of the indicators to be noted when evaluating the results of a particular routine for making the necessary adjustments to optimize results.