Usually three times weekly. For about 3-5 mins Monday morning in SEA. For about 30-45 mins in IAD on Monday afternoon. Then about 30 mins on Friday afternoons in IAD. That's it, week and in and week out, putting me at about 150+ times a year. If I'm intl, I hit some partners up as well. If I'm a few hour layover in ORD or something (created purposefully most of the time), then I'll scuttle around to a few of them depending on how full they are or cell coverage. I find them invaluable in trying to find a place to do con-calls from or simply get e-mail.