How often should I do a Reality Check?

I was just curious as to how often I should do a Reality Check, during my waking hours? I've heard people say there is such a thing as doing it too much and wanted to ask some of the more learned members.

Thanks.

I used to reality check probably about 200 times daily when I was first trying to LD. While I was doing that (a period of about 5 or 6 months) I had very little success. Then I started only RCing when I got a dreamlike feeling, was reminded of dreaming, or woke up. Since then I've had about 15 LDs in two months.

I don't know whether or not it's because of the RCing or some other reason, but yeah, that's all I have to say about that.