Low estimate ~ 10^12;
High estimate ~10^14 years:
Quote:
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This marks the transition from the Stelliferous Era to the Degenerate Era; once star formation ends and the least massive red dwarfs exhaust their fuel, the only stellar-mass objects remaining are stellar remnants (white dwarfs, neutron stars and black holes.) Brown dwarfs also remain.
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.. from
'Timeline of the future' in Wiki (follow the references given, for more info).
Cheers