Get ready to hear my school's period, you will be disbelief.
Our school has 2 weeks with different timetables, Week A, and Week B.
yr 11, 12 start at 7.28am mon,tues,wed,fri which is denoted as period 1, each period lasts 51mins. But if you do Mxt 1 you start at 7.28 on thursday aswell, while everyone else gets a sleep in
Seniors, 2 periods, then roll call, then 2 then recess which is 20 mins then 2 periods, and then at 12.54pm you get to go home.
But, If you do extension courses, e.g. for me I have math ext 2 on tuesday, wednesday Week A, then wednesday week B, and ext 1 on tues week A, which basically means I have 7.3 hour days which sucks but free periods suffice.
Generally, i.e. yr 7-10 roll call 8.55am, then 2 periods, recess, 2 periods, lunch (30 mins), 2 periods, then school ends at 3.06pm
But on thursdays, we have 4 periods, and end at 12.17 but yr 7-11 have sport afterwards.
In summary, we have 8 periods, with each period being 51 mins long, and seniors start at 7.28 and ends at 12.54pm unless you have an extension course