I have a regular Monday slot at 3pm & see him on a Thursday for 3 out of 4 weeks & a Wednesday on the 4th week & the times vary from 2.30 - 4.40pm. My t knows exactly when I come & is always ready for me. I prefer having a regular spot, but I have learnt to except the other day being irregular as there is somewhat of a routine with it. I would go absolutely berserk if my Monday slot was ever changed!