Since you've only smoked 3 times, I bet .25 would get you goin, and .5 between you and your girl (who I'm also guessing hasn't smoked or few times) would get you guys pretty messed up. How many hits do you usually take before really feeling it? I only need 3 or 4 bong hits and I'm pretty stoned and I've been smoking everyday for about 5 months now. I'd say ask your smoking buddies to sell you a $20 sack of dank and you'll be alright for the week.