Expiration Period with Go Phone

I'm thinking of getting a Cingular Go Phone with the Pay As You Go $.25 Per Minute plan. I believe that comes with $10 of starter credit? Also, how long after getting set up with a new Go Phone do I have before I must add more time? I know that there are cards for $25 that extend the time another 90, but how many days does the $10 of starter credit give the phone?

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Good question that I guess no one has an answer to?

Many of the GoPhone Starter Kits list thre original $10 starter time as good for 30 days.

These are the cards and expirations listed on Cingular's website. Note that there isn't a $10 listed:

Card Denomination/Expiration Period
$15 30 days
$25 90 days
$50 90 days
$75 90 days
$100 365 days