Someone once replied to a post that they changed theirs everyone Sunday and Wednesday. I think it was Shaz. So, I thought that was great advice. I try to follow those days. I pick two days a week and they are either Saturday or Sunday and Wednesday or Thursday. Any combination of those days work well for me. Easy to stick to as well.
Waiting til day #8 is exactly what I did cuz I was just tooo lazy to do it on day #7!! Pushing our luck, huh?!!!