If you're looking for a meeting place or a good stop around ½ or halfway between Warri and Benin City, you can try Sapele, Nigeria, which is about 1 hour north of Warri, or a little over 1 hour south of Benin City.
If you drive straight through without stopping at all, the total distance is 101 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, 19 minutes.