The time scale $Delta t$ parameter, which appears in the Bose-Einstein Correlations (BEC) treated in term of the Heisenberg uncertainty relations, is reexamined. Arguments are given for the role of $Delta t$ as a measure of the particles emission time rather than representing the strength property of the correlated particles. Thus in the analyzes of the $Z^0$ hadronic the $Delta t$ given value of ~$10^{-24}$ seconds is the particles emission time prescribed by the $Z^0$ lifetime. In heavy ion collisions $Delta t$ measures the emission time duration of the particles produced from a nucleus of atomic number $A$ which is here shown to be equal to $Delta t =(m_{pi}a^2)/(hbar c^2})*A^{2/3}$ where a is about 1 fm, that is, proportional to the nucleus surface area. This dependence agrees rather well with the experimental $Delta t$ values deduced from the BEC analyzes of heavy ion collisions.
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