When I said time starts, I'm talking about your whole day time and your break time. You get 8 hours to take the test, 7 blocks (1hr each) and 1 hour of break/tutorial/survey time. If you can minimize the amount of time you spend in the tutorial, that leaves the rest for your breaks. Any break time left over when you finish block 7 goes to the time you have to work on the survey... no break time, no survey.
The free 150 is available in Fred 1 and Fred 2 flavors, IIRC. Whenever I've posted the link, it's been to the Fred 2 version, but you can find Fred 1 on the USMLE website.
UWorld does a decent job matching the aesthetic of Fred 2, but there are some Fred 2 nuances like linked questions and the AV things that you'll want to see in the Free 150 before test day.