Would you do a 1-day trial/demo at a school?

I passed the first interview at an English school and I was told to come to the school for the second one, and pretty much stay the whole day to observe lessons and eat lunch with the kids etc. so they can get to know me better and I can also see for myself, how I feel about the school in general.

I am not sure if I should because I think 1 day is too long for just a second interview. I am okay with doing a demo and staying for 1-2 hours but more than that, it already feels like a full shift. Is this a reasonable request? Should I go?