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Issa, not sure if you ever found an answer, but this is all I found on the topic at the USPS site. It doesn't specify any length of time or any "expiration date" for the stale postage, so I'm assuming you could use it just by running the 0.00 strip like you were saying, although sooner is probably better than later. Good luck!
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Stale Meter Date
A meter stamp must bear the current date. If the postage bears a previous or future date, the meter stamp is considered "stale."
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The meter date must be updated daily. Mail must be metered with the actual date of mailing.
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Mail deposited after the day's last scheduled collection may bear the actual date of deposit or the date of the next scheduled collection.
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Authorized dispatch prepared presort mail accepted after midnight may bear the previous day's date.
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A customer who has mail with stale meter dates, but correct postage may run the mail piece through again to produce meter indicia with the correct date but $0.00 postage.
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This correction may be run on the reverse side of the envelope (upper right corner). For flats and parcels the correction should be made next to the existing meter stamp
If you have questions regarding operation or meter settings, you should contact the Mailing Requirements office of your local Post Office facility.
Note: The United States Postal Service examines metered mail to detect irregularities in preparation and dating. If stale dated metered mail is identified by a postal employee (machines do not catch stale meter dates) the mail piece(s) will be cancelled with the correct date. If the mailer submits a large amount of mail with stale dates, the USPS will return the mail to the mailer for correction before it will be accepted.
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USPS Postal Regulations 
