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Bike tires constantly slowly lose pressure, it's normal, especially with higher pressures. It shouldn't be losing air quickly though, such as in just a few minutes of riding. If it is, replace the inner tube.
On my road bike I usually check the pressure and add air before every ride. They lose 5 to 10psi, down from the 115 I ride at usually within 24 hours.
Mountain bike tires can generally go longer between checks due to the lower pressure. Afterhours' every couple of weeks pace sounds about right to me.
Remember that like your car, most tires have a "max pressure" listed on the side. This is unlikely to be the pressure you should set the tire to unless you are REALLY loading up the bike.
Too low, you'll have high rolling resistance, be prone to getting pinch flats, and the bike will feel unstable. Could even roll off the rim if the pressure is really low.
Too high, it'll be a bouncy, harsh ride and the tires are more vulnerable to sharp objects.
Just right and you'll roll along easily on a tire that shouldn't bounce or skip and will absorb small bumps.
"Just right" is dependent on the weight you put on the tire, more weight requires more pressure. There is no harm in a little bit of experimenting and given the way the bike is set up having more pressure in your rear tire then your front. Many riders without a rack, gear, and fish on their bike keep higher pressure in their rear tire.
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