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It is argued that the results of recent precision measurements by LHCb of thelifetimes of charmed and bottom hyperons are very well consistent with thedescription within heavy quark expansion and allow to accurately determinematrix elements of light-flavor nonsinglet four-quark operators over thehyperons and to accurately reproduce the difference of lifemes of $\Lambda_b$and $\Xi_b^-$. When combined with the recent LHCb results on the decay $\Xi_b^-\to \Lambda_b \pi^-$ this leads to prediction of a lower bound on the rate ofthe decays $\Xi_c \to \Lambda_c \pi$.

Update on splitting of lifetimes of $c$ and $b$ hyperons within the heavy quark expansion and decays $\Xi_Q \to \Lambda_Q \pi$