In KoDP I cattle raid most seasons.
A lot if raiding depends on circumstances. Personalities of the ring, size of your current herd, how beat up are your weapon thanes, how often you've been raided lately, etc.
So, established and stable clans trade so they only raid once or twice a year. War clans, clans trying to make a name for themselves, and those on the edge of collapse raid more often. I don't think there is an upper limit, but your neighbors will react by posting more guards or counter raiding, so there will be diminishing returns, even if you get really good at it.