I saw an outline on AADSAS that said 150 characters(with spaces). I did a draft of what I would write-basically one or two sentences for each. I am also interested in what people have done in the past... I could fit more in if I did bullet points.
I waited until the cycle opened and then started on my app. Nothing works better than trial and error, especially where you can't access the app right now. Just settle down and wait until June 3rd to start freaking out about every little thing you have to type in and send in.
If it is the same from last year, then you will be limited to 175 characters to talk about each EC activity. I didn't bother writing in complete sentences. I just listed my duties, etc.