Unfortunately, you do not get to choose your block. Ateneo chooses it for you and you will have to stick with your block till 2nd year (unless you shift or change schedules).
M-W-F classes can start as early as 7:30am (except for PE and lab, which can start as early as 7am) and are usually 1 hour each, except for lab. Your Lit class will always come after your English class and these subjects are always MWF classes.
T-Th classes can start as early as 7am and are usually 1 1/2 hours each, except for lab (2 hours for non SOSE majors and other non-science course and 4 hours for SOSE majors and other science courses).
About the too early thing. You can ask the school (ADAA ata or Registrar.. not sure) to change your schedule if it is really impossible for you to get to school on time. Although there is a big chance they will not grant it. My Intact facilitator (2nd year siya last year) lives all the way in Cavite and is always on time for my block's Intact class every Wednesday at 7:30am (1st sem).
Your class schedule is mostly chosen already by the school for you but can also depend on your random number and on what PE and Natsci you take (unless you're a SOSE major or science major, then you only need to enlist for PE).
My longest break during the 1st sem of my freshman year was 1 1/2 hours. During my 2nd sem, my longest break was 4 hours (PE was 7-8 and my next class started 12pm). I decided to go home na lang during that break. There are many tambay areas naman in the campus and along Katipunan, pero I have to say mabobore ka rin at some point especially pag wala kang kasama. You should have already gotten your random number at this point (I believe they give it to you once you confirm?).
Good luck during your freshman year and don't forget to enjoy!! BTW, ano course mo? Curious lang
