calibrate: shorten the minimum calibrate duration (#44972)#46007

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-44972-to-release-7.1

Aug 12, 2023

+32-45

Commits on Aug 11, 2023

This is an automated cherry-pick of pingcap#44972

CabinfeverB
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