I am designing a Li-ion battery discharger. So the discharged power, gets dissipated as heat. Although I have a heatsink and fan, I cannot make the fan work with full speed because it makes so much noise. Inside the software I have a PID which controls the temperature of device. It gets the temperature data from one of the temperature sensors located on the PCB, somewhere near to heatsink but not touching it. So the temperature I measure is less than the real heatsink temperature. I have set the threshold of the PID to 65 Celsius. That makes temperature to oscillate between 63 Celsius and 70 Celsius. So my question is, are the standard electronic components withstand that much temperature for 7-8 hours? Would it effect the component life drastically? As components I have some power resistors, MCU, ceramic capacitors, resistors, diodes etc. I know there is no specific answer for this question, I just want to get some general opinion about it. Thank you beforehand.
P.S: English is not my native language, if there are some parts that needs to be fixed, please feel free to do so. Edit: There is 7-8 Celsius difference between the hottest component and the measured temperature value.