I wish I could give you some guidelines. So much is speculative and very personal. For me starting a definite new breakout at my predicable time- 6 months of clear preceding it, the cilantro helped with weeks, not so the rash to begin with but no new papuales and the itching was much less so I guess I am one of the luck ones. I had a reason to keep up the cilantro.
I went off because II figured it wasn't helping anymore. I had been clear for months after drinking cilantro daily and afraid to stop it, but then I got slammed. I figured it wasn't working so why drink it? This happens to me with some medicines, they work for years and then stop working so I figured this was another example. Turns out I was probably mistaken about cause of rash, it wasn't GD but a case of shingles triggered by adult preventative shingles vaccine. After 2 months the shingles rash (reaction to vaccine) was clear and figured why go back on cilantro, perhaps I was detoxed and didn't need it? Frogger a blogger on this site for who cilantro worked for went off of it a few months after he cleared up and I don't believe he has had a new recurrence. Follow his posts as he tried this about the same time I did when Kimass1 brought this to our attention. She had been blogging on an earthclinic site and learned about it. She references this site and I read the entire blog from inception, very helpful posts. I am still in remission today and have been off cilantro since around Dec 19. If I do get a new breakout maybe that means heavy metals have built up in my body again and will follow the cilantro detox again.