10 - 20 minutos
Keys in the columns from F4 to V were not responding (F4, 4, r, f, v).
Super easy. A-grade part from iFixit was brand spanking new --- still had plastic protective sheathing on it. Guide was right on. Did it in under 15 minutes while doing laundry.
Have some canned air handy to clean out the fan while you've got the case open.