Should I reseat the CPU fan?

Hey community,

So just this morning, I decided that my stable 4.5 clock on my 2500K was a bit warm for the summer, so I took off all added voltage and lowered the clock down to 4.3. I've been running prime 95 for maybe half an hour now and I'm getting temperatures on all cores a bit less than 60C. Of course I plan to run prime95 for longer than this, but I was wondering if these temps were maybe a bit high.

I'm running a 2500K with a 212+ on it, with 2 120MM fans on it. I'm also running a NZXT Vulcan, which is a smaller case, but I've got alot of fans running in it.

Also, if I were to reseat it, how long does thermal grease last? I've got some Arctic Silver, but its probably a month or 2 old.

Thanks,
-Gunner