How many turn is your motor ?
My friend has Transpeed 3.5T with 13mm sintered rotor ( transpeed = lrp X12 ), and he end up with 78.9C after 5 minutes run. He use 10.98 FDR
Novak said 80C is the maximum safe limit for motor and esc. More than that..... I think the electronic components on PCB board might get fried or short lived.
On Road : Xray NT1 , RX8 , T4 || Mugen Seiki MRX4-R , MTX4 , MTX3 prospec || Tamiya M03 , M04 || Top Racing Sabre FD2
Off Road : Xray XT8 || Hobao Hyper 8
Radio : Futaba 3PKS || KO propo EX-10 eurus