I've never spent to much time in the friend safari. I'd go in, catalog the 2/3 Pokemon available, and leave. But after hearing shiny Pokemon seem to be more likely there, last night I started aiming for a shiny Aipom in a safari were it's only that and Mincinno.
No luck so far, but I DID catch a female Aipom in a Heal Ball just in case I give up and use the good 'ol Masuda Method.(since Heal Balls match shiny Aipom quite nicely)
I've only spend 2-3 hours looking at the most, but I'm going to continue tonight.