I have had mine on lte throughout the workday and the battery has lasted. I do not have nor observe children - unless teaching in a post grad area at a university counts - so indeed I have no idea what they do. I was in school at a time when nuns walked around with rulers and would clobber you if you were trying to play with something - so I probably wrongly expect (I don't know why I have such an unrealistic expectation- parents even accompany their offspring to law school (where I teach) these days) that some semblance of order is maintained and if a child were playing with a watch a teacher would notice and call them out for it. I have many friends who are teachers and they are constantly undermined by the administration and parents.