In my proper save I probably would have somewhere around ten. I don't know the exact amount because for some strange reason killing jeb bob and bill revived everyone who had been killed previously. In my foolaround save I guess around around hundred. decided to see how many kerbals i could kill but after a while i the game decided it didn't wan't me to do anything, and locked every button
First, try bunch of ridiculous designs and blow stuff up on purpose, second go to the mun to see the new craters, and after that continue to crash things
Managed to land a plane with part of it's wing missing after misjudging the distance to the rocket I were trying to destroy. Also did my first ever flight to eelo, an unmanned lander which was able to touch down with no problems. And killed a bunch of kerbals testing ridiculous planes and rockets