If you're looking for a meeting place or a good stop around ½ or halfway between Do Gonbadan and Lar, you can try Akbarabad, Iran, which is about 3½ hours southeast of Do Gonbadan, or about 4 hours northwest of Lar.
About ¾ or three fourths of the way, you can stop at Jahrom, Iran. This is about 5½ hours southeast of Do Gonbadan, or a little over 2 hours northwest of Lar.
If you drive straight through without stopping at all, the total distance is 576 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 7 hours, 45 minutes.