Trying to quantify "too much" for someone else is hard to do. I know what my work capacity is and I can/could do what you have posted (including the punching bag on days 6 and 7). Give it a shot, make sure you eat enough to help recover from the days activities and really pay attention to how you feel each day. I don't see this as implausible, but if you eat like a bird and don't get enough sleep you will be dead by day 3. Lots of variables.
People too weak to follow their own dreams will always try to discourage others.