2,518,483,968,000 choices
Charile,
you could be up all night
If you include helping out in the Youth class room as rotation option and you choose to not see any demonstrator more than once.
there are about
2,518,483,968,000 possible schedules you can make ( there are actually more but I took a quick estimate)
the good news is there are no bad choices.
have fun
-Al