What is the frequency of Undead Jester invasions?

Question

I just want to know if the invasions of Undead Jesters occurs in some pattern of time (1 invasion per hour for example) or if it's just random, thank you

Answer 1

Well, these invasions are random, sometimes i have met 2 within 5/10minutes, sometime i wait for them few hours. They have 3 spot respawns every city and they don't change the spots.