I'm at 25mm (1"). Currently have them naked for a month so I can build up more tissue. I was at 1.5" for a little bit, but me being impatient ruined that for me and I had to take them out for 6 months or lose my ears from necrosis.
6 months naked and lots of emu oil, jojoba oil, and holey butt'r massages has helped them a lot! I carry a holey butt'r around with me at all times these days.