I have managed 3rd day hair with my current routine! 4th day was good but I did wear it up that day.

Myrna, I agree completely that we have to adapt to do what works best for us. I hate seeing blanket statements to do this or not do that when it comes to things like this. And I agree with the idea that diffusing is not extremely damaging - especially compared to flat irons and other direct high heat things. (The hot sock and moving it around probably even less so!) I also don't dry completely with the diffuser and I remove excess water first. I do notice my dryer is hotter by the end of section two than it was at the start so I use the cool shot intermittently.
remember, with all advice or suggestions for your hair, YMMV!!
My hair:
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
My routine:
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)

Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.