I'm not saying this is a good idea for us, but on another forum we have a 24 hour rule. If you don't make a move within 24 hours of the person before you having moved, you are auto folded. There are exceptions made and what-not, but it's a general rule.
We could make a 48 hour rule, or have no rule and just wait it out. I'm not really fussed myself, but I know some people don't like to wait.