If you're looking for a meeting place or a good stop around ½ or halfway between Troy, PA and State College, you can try Garden View, PA, which is almost an hour south of Troy, PA, or about 1 hour northeast of State College.
Other possible places to stop near the midpoint include Level Corner, Antes Fort, and Nippono Park.
About ¼ or a fourth of the way, you can stop at Marsh Hill, PA. This is about half an hour southwest of Troy, PA.
About ⅓ or a third of the way, you can stop at Powys, PA. This is about half an hour southwest of Troy, PA.
About ¾ or three fourths of the way, you can stop at Cedar Springs, PA. This is about 1½ hours southwest of Troy, PA, or about half an hour northeast of State College.
If you drive straight through without stopping at all, the total distance is 112 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 2 hours.