If you're looking for a meeting place or a good stop around ½ or halfway between Turek and Swiecie, you can try Aleksandrow Kujawski, Poland, which is a little over 1 hour north of Turek, or about 1 hour south of Swiecie.
Another possible place to stop near the midpoint is Ciechocinek.
About ⅔ or two thirds of the way, you can stop at Torun, Poland. This is about 1½ hours north of Turek, or almost an hour south of Swiecie.
If you drive straight through without stopping at all, the total distance is 205 km. 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, 24 minutes.