Yes, I know that coincidence of two such events is highly unlikely, but to "compare" paths of gravitons and photons we need to imagine how much time divides 2 e

Yes, I know that coincidence of two such events is highly unlikely, but to "compare" paths of gravitons and photons we need to imagine how much time divides 2 emission events. Seconds? Minutes? Hours? Perhaps it isn't very important but it's still interesting.