Nice! I can see what Bob means though I don't think it is really disturbing all the way, just here and there, BUT I listen with the headphones on right now, so that might not be a great reference since the they are pretty clear panned and therefore on the headphone they do not interfere with eachother a lot. Maybe you had a headphone on while recording? Well it might also be solved by EQ-ing the guitar some at the low end. Cutting there might make the guitar more transparant and lighter in the mix and so a bit less interfering. You could also trade piano with guitar once in a while or mute the guitar on the really "hard to hear the instrument" parts. Anyway, maybe a little long yes, but nevertheless a very nice track!

I'll be back...