Getting to Papermill from Manhattan

I haven't been there in a couple years but pretty sure the train station is walking distance though you may want to wear good walking shoes. The ride is about an hour from what I recall so I think 2 shows are possible though you may want to stick with an 8pm curtain to be safe.

It's a pretty straight shot to take NJ transit to the Millburn station and there's a pretty helpful map right at the station on two different ways to get to the Papermill, and the longer route is probably not more than 15-20 minutes walking. On a Sunday last year, I saw a 1:30pm show of Songs for a New World, had a late lunch in town, and got back with plenty of time to spare for a 7pm showing of Kimberly Akimbo. The main thing is that I think the train only comes about once an hour, so you'll just have t make sure you're aware of the schedules if you have a second show planned that day.

When you get off the train, follow the path that runs parallel to the train tracks. Walk on that for about 5-10 minutes. You will see a some athletic fields on your right. Make a sharp right turn, continuing to walk around those fields. The theatre is about another 5 minutes ahead. But again, you will likely see a number of people walking the same direction to the same location.