Mmmh, I don't know if I understand well your point. @mihha ๐
I explain what I'm trying to do.
Example: User subscribe today (say user U).
I want to create a segment (say, S) such that user U is part of that segment in 45 days (that is, from today, 3 May 2021).
So user U receive emails sent to segment S only after 3 May 2021.
Hope this is clear ๐
(sorry but maybe my English is not so good to be fully unrestandable)