yes, stable & acceptable temperature.....

frankly speaking, running hours of stress test program r like pushing the CPU >100% for a long period of time.

there is no way, under normal, usual usage, the CPU will ever gonna get loaded to dis extreme.
unless u run hours of rendering o something similar.

actually if the OC is stable wit 10 minutes of prime95, u can play game for whole day & it will not crash.

den test for 2 hours, but error may occur in >2 hours.
den test for 12 hours, but error may occur in >12 hours.
den test for 48 hours, but error may occur in >48 hours.
den y dun keep it running 4ever?

the point is, is really depend on ur usage.
like i said, if browsing internet, playing games (even hardcore), is wat u pc does, den 10 minutes of prime95 can edi provide rock solid stability.

lets say u're famous, or politician. it is appropriate for u to get an armored car for safety purposes coz there is high chance som1 will wanna kill/harm u.
but if u're a normal person, not famous, no ntgh, getting an armored car, u're just being paranoid. y dun just get normal car?
i hope u understand the metaphor.

yes, unstable OC will harm other h/w as well.....
but dis doesn't mean 10 minutes if prime is not stable. it is very much solid.

metaphor:
it's like comparing 2 cars, car A wit 90% safety rating, car B wit 50% safety rating.
yes, car A is safer den car B, but the point is, lets say minimum passing score is 40%, even though car B is less safe compared to car A, it is good enough.