I dellded my 3770k just under 2 years ago. I run with an H100 and OCed to 4.8GHz. I am not experiencing any issue at the moment with temps or throttling but was wondering, is there a rough time frame on when i should replace the Liquid Pro TIM (under the lid) or Active Silver (top of the lid)? 

If your temps are OK, why touch it?    B)

Bert, I am a big believer in"if it ain't broke don't fix it" but I did find this article, was curious if anyone else does "regular" reapplication. 

How often should I replace my thermal paste?

You've got to be kidding..

As Burt said... why on Earth would you mess with it when your temps are good.

 

Logic would dictate that if your temps haven't degraded then no action is required.