I use 13's. They actually last a bit over 2 weeks if I'm sure they're off every night but mine aren't easy to keep off if they're handled at all. I ran out and bought a pack of energizers once and they lasted me about 5 days. I was changing them constantly. Maybe I need some new...
I had a ton of ear infections and a few surgeries on my right ear, it's now moderate-severe reverse slope. My left ear isn't tooooo bad, but they don't know why. I have the hearing of an 80 year old man in my left ear (so my audiologist jokes).
All day here too. Yesterday I was actually alone in my house for hours (doesn't happen much with kids) and I took them out, but got nervous I wouldn't hear the phone or door.