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Gravitational microlensing has been employed to identify massive halo objectsby their amplification of distant sources; MACHO searches have studied eventtimes $2 h \lesssim t_0 \lesssim 2 y$ corresponding masses in the range$10^{-6} M_{\odot} \lesssim M \lesssim 100 M_{\odot}$. We suggest that largermasses up to $10^6 M_{\odot}$ are also of considerable interest. It has notbeen excluded that there is a significant number of halo black holes with suchhigh masses as suggested by cosmological entropy considerations and potentiallydetectable by high longevity microlensing events.

High Longevity Microlensing Events and Dark Matter Black Holes