A minimum number is a very good Idea. As is estimating events and puzzles and the like! I'll have to do a bit more brain storming and give my self a rough estimate for those things.
I haven't yet given a lot of thought to puzzles, but I know I'll have quite a number of key events as well as battles. I can not even fathom the bugs I'm going to run into!
I'll probably have to cut back on events and battles as well. The more cutting I do on paper I think the less frustrated I'll be when it comes time to actually make the game.
I am Using MZ, so at the very least I have layers!
Thank you much for the ideas and advice!