3 lines seems reasonable, though I still maintain that after a certain point, duties should become a "given". Though I suppose I am biased being in a research-heavy program and it might be more necessary if someone has say...one poster as 3rd author and nothing else. I'd hope from looking at my CV it would go without saying I know how to submit an IRB application, analyze data, etc. I long ago pared down descriptions of research positions, but do still give a vague overview for clinical positions (i.e. client type if not obvious, tests used) just because there isn't any other place on the CV where one can glean that, though that will probably go too once I'm done with practicums/internship.
I get not having written a grant since there are plenty of faculty who don't write grants. I can't fathom getting through grad school without writing an IRB application (save for these FSPSs with their "Narrative review" dissertations). Heck I can barely fathom getting INTO grad school without doing it...we typically have our coordinators working on them.