Yes, it appears as though the window is pretty narrow. Complex life on this planet is only 500my old. It took a long time for photosynthesis to oxidize all disolved iron in the oceans so that oxygen could finally accumulate in the air.

From: AlanSiefert<-shawn at 08/16 13:08

> Makes you realize that the time allowed for intelligent life to evolve is actually pretty short (assuming ~4B years between genesis and intelligent life). Probably the reason we haven’t made contact yet - the window is very short. The best chances for contacting intelligent life will probably involve looking for civs that have transcended to Kardashev II+.

CC: #[4]