Its going to be difficult, even if the pay is relatively high. You need rest sometimes to refresh the dying muscles and tissues. Based on the time you are using to work on the site, unless one will work for at least 12 hours everyday for straight one week with other for sites too.Everything is dependant on how the online paid to post forum works. If they offer more posting opportunities in a day and based on their point value in terms of relation to dollar, then you can make up to $30 in such time frame. But to be very honest, it's going to be very difficult.