3-5days is normally what I have experienced with dummy withdrawl.

They do start to find the dummy in their sleep. It doesn't take long and tommy tippee have dummies that have glow in the dark handles

I haven't weaned a dummy before 3 yrs but mine that use/used them still have reflux so we needed them.

Personaly Im happy with my kids and their dummys and hate the bad press they get by people. They have been a godsend in our house