Sunday evenings 9pm my time would be wonderful for me. I keep missing the German chat because it's 9pm Satuday nights and that's an evening for 3D visitors.
If the chat hour is to be a daily thing, I could probably manage two or three nights during the week at that same time, although I'd usually have to miss on one or two nights each week due to having company.
During the week I am also here from around 8 am until 4 pm with the occasional break for running errands. So I'm flexible. Just thought, like I wrote, that if nobody else was going to venture a time, I'd pick my ideal slot.