My first project was called Runsetter. That took me about 1 week. Of course, that's after I learned from the Quick tutorial (I still think that's pretty important that you have to grasp the abstract idea of a red circle becoming a fully animated and interactive "character") But of course, I learned that in a programming class and makes me lose some credibility with non-scripters, eh?
To add, but hopefully not to scare you away, I've been working on the REAL Runsetter for about a year now. One can learn a lot in a year (out of almost the three years I've been using SGDK). I mean, I've released a ton of demos. Those represent my learning progress.
So it's important to always keep learning. I guess that's my advice.