As Bob says, tires should not lose pressure anywhere near that fast. Something is not right. If I were you, I would first mix up a soapy water solution, and paint it liberally on each tire valve. If it blows bubbles, you've found the problem.
If not, paint it liberally all the way around each tire where it meets the steel wheel. Outside and inside. Bubbles?
If not, your next step is probably to remove each wheel and immerse it (at least the tread) in a big deep pan of water. Look for bubbles coming from the tread. If you find 'em, you've found the leak.
A tire shop can repair any of these quickly and easily. If they remove the tire from the wheel, be sure to rebalance the thing after the tire is remounted.
Bill
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