Per the Crest website for their "3D White 1-Hour Express Whitestrips":

"Usage: Apply once a day for 1 hour. Full results in 7 days."

So, their intended recommendation is a maximum of 1 treatment per day. But keep in mind that it's perfectly fine to use the strips less frequently.

Whitening teeth like this is simply cause and effect, nothing more. If after a few treatments your teeth are the color you're after, then call it quits. Put your remaining strips in the refrigerator (to maximize their shelf life) and use them for touch up whitening as you need them.

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