Well yes it’s safe, just not “as” safe. 80second thermal protection is quite long in my experience. I’ve never needed to increase this unless :
I live in a very cold environment
I have a part fan (or other fan) running blowing cold air on the heaterblock
I have a dead or dying heater cartridge
I have a dead or dying thermistor
Have you considered adding a silicone sock to your hotend?