Yes this is common. Biggest problem is that like in my case, one of my clients is four hours on a Friday. Now I can fill that spot several times over as it's the most requested day by clients. So I have done and the client when ( if ) they come back will have to take another day. Running a business here and not losing money on the hope they come back. They have been with me a good while so hope they will but I have bills to pay and a wage bill to cover.