I log on when I can, perhaps 2-3 times a week for an hour or so. some weeks I don't log in at all. Depends how busy I am. going to that from playing 7 days a week, 9+ hours a day back in TBC, I'd say I'm casual.
I don't raid anymore, the time I do spend in game, is levelling alts, collecting my pets (pre pet battles) running old content for transmog gear, or just to help friends and guildies. doing some dailies, running a dungeon now and again, annual events, farming mats for the guildies that do raid, finishing up achievements, all this can be done at a nice casual pace with the time I am able to play