I don't think it's too important. I am exhausted spending a month writing my PS and going to spend a day to write them. I'm not answering the first question, since I wrote every predental activity on the AADSAS application. I'm just gonna write like a paragraph for the other questions, but I think some of these questions overlap with the questions the other schools ask in their supplementary applications so it may be a good idea to take time to write and revise the essays for them though.