noob question about geometry
 

I have some noob questions. I have been riding for a little over a year and am beginning to research the next step up to a nicer bike...currently have a jamis ventura sport (sora, aluminium).
what exactly should i be looking for when someone says geometry? how will i know on a ten minute bike ride how comfortable a bike will be on a 2+ hour ride?
Thanks guys!

You won't, a ten minute ride can in no way ever translate into how something will feel for a two hour ride, unless something is terribly wrong on the ten minute ride, becuase if it feels good for ten minutes, it might kill you in two hours.

Suit up, drop by the shop and take it for a two hour ride!