I've not been able to figure this out nor can I find any documentation for
this: how long does OSPF wait for others to cast their vote before doing the
DR/BDR election?

If R1, R2, and R3 come online with 10.1.1.X/25 (X=RX) ip addresses, and R1
and R2 see each other's messages, they will start an election.  If R3 is
there, it wins... if it's too late, R2 wins.

When is "too late"?
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