vololiberista,
Yes, it is a ridiculous time. I've been on to an FSX forum and it seems that I am not alone, others are experiencing similar times without finding a cure for it. (It has always been a problem - 90% not running, 10% running (about)).
I've done as you suggest and when FSX re-starts, it prompts me to allow/disallow my Ad-Ons. I've not allowed them to load so that I have no add-ons taking up hotkey slots. Still the problem remains??
Rgds,
Robin