The best replacement for concentration is time.

The best alternatives to concentration are rated as following:
★★★★★  time
★★★★  absorbance
★★★★  density
★★  major
★★  molarity
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★★  ph
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Your alternative for concentration is not listed? Suggest!
Speaking about concentration, one probably shouldn't forget about absorbance.

Other search terms related to concentration and their ratings are:
★★★★★ absorbance
★★★★ ph
★★★ mass and volume
★ molecular weight
★ ksp
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Google Trends

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concentration
time
absorbance