Too Scrub or not too scrub..? non ECC...

asus rog crosshair vi hero x370

G.skill Flare x 3200mhz non ecc


small question here. since i am running non Ecc memory like most and no ECC setting unless i over looked it. ide' like to hear from top what is to much scrub time and not enough scrub. i know it  depends on usage. i figure every 4 hours to fix errors would be suitable. what you say?

i do have system mechanic to defrag memory but i dont run it on auto. so i would use that manually. and defrag is different anyway..