And to prolong string life, regularly give your strings a wipe with a soft, dry cloth especially after playing. I do that and my, do my strings last! (And they aren't even coated. I've used 6-month-old strings live before :mrgreen: )
And keeping your guitar in the case when you're not playing for a long period of time also helps especially if your guitar's a solid-top or all-solid acoustic guitar. If you use all-laminates (like me), leaving it on the stand all day long is perfectly fine.
Perhaps you could elaborate more about your guitar, because different specifications (solid wood vs. laminate wood, and even between brands) means different guitars will require different levels of maintenance.