@Devraj Grewal thanks a bunch for your input - appreciate it sir! I relayed your response to my coworker - will let you know if she has any additional questions.
@Malik Zafar
I agree with what Devraj has said however I am interpreting your colleague's question a bit differently.
She seems to be asking about when the lead is eligible to requalify for a campaign, if the campaign's qualification rules restrict it to once every 30 days. Does the 30 days start counting when the lead qualifies and enters the flow or when they complete the flow?
I am reasonably certain that this is evaluated based on the date they qualified and entered the flow - the length of the flow in days would be irrelevant.
So 30 days after they qualify, they could pass through it again.
I would structure things to ensure that the lead doesn't re-enter a flow they are already a part of, as things tend to become very unstable/unpredictable in that scenario.