The best replacement for duration is maturity.

The best alternatives to duration are rated as following:
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★  radius singularity
★  dv01
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★  intensity exercise
★  oakridge shingles
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Speaking about duration, one probably shouldn't forget about bonds.

Other search terms related to duration and their ratings are:
★★★★★ bonds
★ convexity
★ in bond funds
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Google Trends

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duration
maturity
modified duration