That's impossible to say since we don't know what level you are trying to target and your target would depend on your CYA number and if you are working with a fresh fill of sparkling water.......or trying to clear up a cloudy algae outbreak.
You can use pool math which has a link at the top of the page to put in your "now" numbers and your target numbers.
Do yourself a favor and throw the strips away.
What other test kit do you have? Is it one of these: Recommended Test Kits?
OH, just saw the signature. That will give you an idea of the CYA, but it is not going to be sufficient to follow the ShockLevelAndMAINTAIN Process. You need the FAS-DPD chlorine test.
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