There is no specific limitation.

However, it’s recommended not to run too many campaign tests simultaneously targeting the same segment of customers. 

Why? 

Because the more tests you run simultaneously, the more difficult it is to understand which variation of which test ultimately impacted positively or negatively the journey of a customer. As a rule of thumb, we always recommend our customers to run Experience tests instead of multiple Campaign tests simultaneously whenever they want to create tests to ultimately evaluate funnel & holistic shopping experiences.

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