I'm at school with most of them so I see them five days a week for about 6 hours but I still text most of them almost every day, if not every other day. Then at the weekend we are normally doing something for one of the two days then too :)
Usually whenever they contact me or whenever I want someone to talk to.
My few very close ones, at least every other day, everyone else is sporadic.
I text certain people everyday or every other day. It honestly just depends on the person....