We do our best to respond to all queries by the end of the following business day at the latest; we often respond more quickly than that, and sometimes it takes us a bit longer. Our first priority will always be to respond to mail from folks that have purchased a license for one of our applications.
When we make a new application (or a new update to an existing application) available for folks to try out, we tend to get much more email than we do at other points of the year. During those high-demand periods, we will respond to as much email as we possibly can, but we can't promise to respond to every message for those specific versions of our software. Rest assured that we do read all email, for all products, and while we may not be able to answer your question directly we do keep track of all user requests and bug reports.