Good Idea to play Uncharted 2+ODST+MW2 on HARD MODE???

Uncharted 2, MW2, ODST, Ratchet and Clank Crack in time, Killzone 2,

i figure since these games are relatively short, u think its a good idea to play on Hard difficulty settingto increase the game length or will it be tooo frustrating.

for instance, I couldn't conceive plating Gears of War 1 on the hardest mode as i thought normal mode was very challenging?

Take it easy dude. Do something fun and relaxing in between each game or you'll go insane. Also, don't do it on weekends because it feels like work.