Hi there,
You have the right for a break after each block you go through. If you skip the tutorial, your total break time is one hour. However, if you finish a block early, you can add this time to your total break time. I think that the best thing is to take 5 minute breaks until you are done with the first 3-4 blocks, so you can have something to eat in peace and quiet, and you can have a couple of bigger breaks before your last couple of blocks, when you will realy need it. I don't think that time is a problem in step1. I took it 2 weeks ago, and 60 minutes was enough to go through at least 2 times over each block. I had a lunch break of about 10 minutes, and before the last block, i had 40 minutes of break time left. I used only 30 of them, because I was so tired that I just wanted to finish with the damn thing and go home.
Hope it helps,
Theodore