My current cycle is one hit per day... usually in the afternoon. Sometimes 2...
if I take a nap after the first one goes away I’ll wake up with another one just as bad or worse.
Also I usually have shadows all day before and/or after.. sometimes a migraine all day.. during a cycle my head feels cloudy all the time.
In my opinion clusters are night and day between anything else.. and I can easily tell when I’m having one... my right eye kills, gets puffy and nose gets runny..
the time for me seems to switch . I would say yes the times do change.