I'm pretty new to brewing too, but it looks like a pretty solid grain bill. My only question is why use crystal 60 and 80 instead of just one or the other?
Also, I'd probably just mash for 60 minutes like you usually do. Can't hurt anything.
Well I planned on using all 80 but the color went up just a little above the standards for brown porter so i figured i'd just bump the color down by switching some out for 60. and i think i am leaning more towards doing the 60 minute mash just to be safe