What should I do all day at work when I only have to work one hour a day every Tuesday?

So my new Winter 2023 teaching schedule kinda sucks. I have SIX classes on Friday! That's six hours in a row of teaching! And on Tuesday, I only have one class.

Yeah, they scheduled me to where I only have one class in an eight hour work day. I have three on Monday and Wednesday, which is typical, and two on Thursday. Honestly, I'd rather have three classes Monday through Friday, totaling the 15, instead of one day of almost nothing, and a full heavy workday on Friday.

I meet with these students only once a week, so I have to teach a total of 130 students a week, with an average of 9 students per class. It's more work than it sounds like, because I'm not meeting them with them two or three days a week, like other English academies, but just once a week. Hence, the 130 kids.

But that's beside the point. I now have to come in to work every Tuesday, starting this week, until February, just to teach one class a day. Not that I'm complaining. It's just weird. Besides grabbing lunch, I have to stay in the building from 1pm to 9pm, for contractual reasons (although it's not enforced much by the boss; it just looks bad if they visibly see they're only paying me to work one hour a day every Tuesday; at the very least, me being on-site makes it seem like they're getting their money's worth out of me.)

TOO LONG; DIDN'T READ:
I have to come in to work just one hour a day each Tuesday this semester, but stay from 1 to 9pm, like normal.

What should I do all day while in the building? (Besides waste time on GAG, like I'm literally doing right now.)

What should I do all day at work when I only have to work one hour a day every Tuesday?
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