If the weather over the next few months remains near average I'd expect most of the areas in the fairways to recover within 4-6 weeks. Those areas that do not will be seeded and/or sodded.
We have been using plant growth regulators during the heat so the plants will focus their energy to the roots as opposed to new leaf growth. Even though the plants will turn brown during heat stress most are not actually dead, but dormant. The extra energy stored in the roots during this time helps them survive until a break in the weather occurs. The fairways will come out of regulation in the next 1-2 weeks and a surge in leaf growth will occur. This will aid in recovery as well.
Also, please follow our recommended guidelines for driving range use. The red arrow is pointing to what we DO NOT want to occur, which is a large area without turf. The green arrow points to the proper method with is to leave strips between long lines of divots for faster recovery. Thank you for your help with this.