come from the kinetic energy of heavy quarks.

In Figs. \[ccu\]-\[bbs\] we have shown the dependence of baryons lifetimes from the values of light quark-diquark wavefunctions at the origin. We see quite a different behaviour withthe increase of $|\Psi^{dl} (0)|$-parameter.

Here, we would like to note, that in this paper we do not give a detail discussion of nonspectator effects on the total lifetimes and semileptonic branching ratios of doubly heavy baryons and promise to fill this gap in one of our subsequent papers [@Onishchenko1].

Finally, concerning the uncertainties of the presented estimates, we note that they are mainly determined by the following:

1\) The $c$-quark mass is poorly known, but constrained by the fits to the experimental data, discussed above, can lead to the uncertainty $\frac{\delta\Gamma}{\Gamma}\approx 15\%$ in the case of doubly charmed baryons and $\frac{\delta\Gamma}{\Gamma}\approx
10\%$ for the case of $bcq$ - baryons.

2\) The uncertainties in the values of diquark and light quark-diquark wavefunctions lead to $\frac{\delta\Gamma}{\Gamma}\approx 30\%$ in the case of doubly charmed baryons and $\frac{\delta\Gamma}{\Gamma}\approx 15\%$ for the $bcq$ - baryons.

Thus, the estimated uncertainty in predictions for the lifetimes of doubly heavy baryons is close to $25\%$ in the case of $(bcq)$ - baryons, 