Responding to Part 1 with regards to the time it took me on each of the four subunits in Unit 2. It took me about 4 hours (an hour less than the 5 hour time). I completed this in 4 hours as I had very little distractions other than a few times having to answer home phone calls (those unwanted-trying to sell you something). I have prior knowledge of time management and are normally pretty good about using my time wisely; focusing on what tasks are needed for today and knowing some tasks can be put off until tomorrow.
Responding to Part 2, my Pomodoro technique that works for me is probably about 45 minutes followed by a 15 minute break. My attention span and focus is pretty good so I really don’t need a break after 25 minutes. I can be productive knowing I just need to get the job or task done. I make a list of my priorities indicating what really needs to done right away and followed by other priorities which could wait. I don’t really get stressed by these priorities. There is no need to stress over these as that will just create worry, stress and will not help you in the long scheme of things.