What duration do you typically choose for email inactivity filters for B2B emails?

B2B list hygiene is a crucial topic in email marketing 🧼
Many professionals emphasize the importance of keeping your contact list clean, but the definition of "clean" can differ significantly.

What duration do you typically choose for email inactivity filters for B2B emails? (Inactive = no clicks / no opens)

A) 1-3 months

B) 3-6 months

C) 6-12 months

D) 12+ months