>If I do 10, there better be an increase!<
Or what? There may not be. It might require more time, or more weight, in order for you to deform your tissues enough to measure a gain. That is just the way it is. Different for every guy.
>For how long to you think someone should be hanging before they try and get to 10 hrs per week?<
It is different for each individual. Some may be able to do it immediately, and some may take months to work up to ten hours per week.