During a sell-out
MNSSHP, we were able to knock off Donald and Goofy (together), Daisy (alone) and Minnie (alone) in around 90 minutes. However, we did so during the first parade/fireworks to try and avoid lines (we attended a second party later that week and had reserved viewing w/ our soirée ticket, so didn't mind sacrificing those events for shorter lines). We then rode a few rides, did some trick or treating and made it down Main St. to see Mickey. There was NO line as the 2nd parade was about to start. We saw Mickey and walked out of Town Square just as the parade was about to pass. There were very few people watching from the end of Main St. and we got a spot right on the ropes. It was ridiculously good/lucky timing.
So based on my experience, if you do Santa before the party and then line up for the Dwarfs to be out of line as the party is starting (or close to it), you should have no problem getting all these meets in. After meeting the Dwarfs head into Storybook Circus and knock the rest out except Mickey, then hit him on your way out. (I'm assuming here that the characters are meeting in the same places they did during the Halloween party, where Daisy, Minnie, Goofy and Donald were in SC, plus the addition of Scrooge for
MVMCP. Mickey was alone in TS). Depending on how quickly you are through the Dwarfs' line, you may be able to get the SC gang done before the first parade, definitely before the fireworks. And can them always catch the second parade of you miss the first.
Good luck and have fun!!!