BP going off feed, when should start getting concerned?

I know that BP's can and will stop feeding from time to time but at what point should I start getting concerned about the fast?
All my snakes are in the same rack system that is universally controlled and the temp and humidity are within 85-90 and 60-70, respectively.
Two of them, my piebalds, have stopped eating, it's been about 30 days. The other 8 are eating well.
All of them are approximately 6-8 month old and don't seem to have any significant issues that are going on.

I know a month of not eating isn't a big deal but I was just seeing what you all thought.

Thanks!:)

no real need to worry unless they are losing noticeable weight. 30 days isn't that long. I only feed males that age every couple of weeks.


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