  We present evidence that quantum Zeno effect, otherwise working only for
microscopic systems, may also work for large black holes (BH's). The
expectation that a BH geometry should behave classically at time intervals
larger than the Planck time t_Pl indicates that the quantum process of
measurement of classical degrees of freedom takes time of the order of t_Pl.
Since BH has only a few classical degrees of freedom, such a fast measurement
makes a macroscopic BH strongly susceptible to the quantum Zeno effect, which
repeatedly collapses the quantum state to the initial one, the state before the
creation of Hawking quanta. By this mechanism, Hawking radiation from a BH of
mass M is strongly suppressed by a factor of the order of m_Pl/M.
