Four times a week, but since mondays only include shoulder movements and calves (For what I have a very good reason - so don't you go all laughs at me), you could take it down to three core days ..
I will usually help out those who are fairly new to the gym, or "the elderly". I wouldn't want some old geezer who looks like he never touched a weight to crack his back because he performs his squats like they were a bend-lower-back-to-Standing-Calf-raises.
I'll never give advice that is not...
I'm stuck at two years here ... I've been doing sports all my life, but I'm dedicating the next 40 years or so to muscle ...
I'd like to thank all the fat people at work for the enormous motivation you provide me with every single day ...