OP, your post left me with a lot of questions.
Firstly, what's the health of your battery? Use Coconut battery and see how low it is. Since your notebook is almost a year old, I'm guessing your health could be down to about 80% by now (assuming you travel with it often). If this is the case, then it might explain why your battery is draining at the pace it is. flopticalcube indicated that the battery loses about 1% per hour when asleep. If your battery's health is at 80%, then 80-24(for 24 hours)=56% (ok, so the math is bad, but it's probably around there). This still doesn't explain your hour to one half of an hour's battery life, but it might be a contributing factor.
According to Coconut Battery, I'm at 88% or original battery capacity
Secondly, how many cycles have you gone through on your battery? I realize that this is similar to the first question, but sometimes apps aren't the best at estimating battery life. If you're above 300 cycles, then what I wrote above probably applies. If you 250 or less, then maybe something else is wrong.
I've had 48 load cycles
Thirdly, when you awaken your macbook, what apps are you running? If they are energy intensive, then I can see how your battery would drain so quickly.
Often I'll have Word, Keynote, Safari, Firefox, Excel, iPhoto open, but I also try to quit/close those before putting the machine to sleep.
Fourthly, when you awaken your macbook, what's the percentage displayed? Is it high or low? This might also be affected by your last battery calibration.
Roughly 30% or less
Fifthly, do you keep up with your battery calibrations? If not, do so. Your macbook might 'think' it has less power than it really does.
I do the calibrations every few months, I've owned this computer for since late January, I've done it at least twice.
Sixthly, how long does your macbook last from a full charge if you don't let it sleep? IE, charge it, and then use it fully until depletion (you can time this the next time you calibrate). If the time is two hours or under, you might have a bad battery.
I get 3.5+ battery usage under constant usage, more if I keep one app open at a time and drop the backlighting. I can go a whole day with intermittent use.
Seventhly, do you use any devices with your macbook when you awaken it from sleep? iPod, BT mouse, etc? These things might affect your drain more than you'd like.
No.
Ok, a lot of questions, but if you can answer them for yourself, you'll know if you have a bad battery. If you do, you'll have to contact Apple and tell them you want a new one.
