Hoses rot on the inside of the tube and they de-laminate. There is no inspection for that.
Once you get to a place where you question the integrity of the hoses, replace them. Because they hold up to 20psi, when they fail it is explosive. Not a small leak. Its usually a split that will dump large amounts of boiling coolant on your legs and feet, on the road and on your rear tire.
You do not want to be riding when a coolant hose goes.
2014 Yamaha FJR
2001 Suzuki Bandit Highly modified