BlackOps

Alright, ive had this game for almost a week and im starting to get the hang of it. Two things i havent been able to figure out yet: 1. The game time elapsing is very annoying and i dont have time to sit around for 30 mins doing nothing just for a tow ship to come, so i want to no how if its possible do u make time speed up? 2. The game FAG mentions that u have to use -i to enable invinciblity mode but i cant figure out how to do it. Plz help