If Eren didn't interfere and just let things play out, how long would it take for Marleyans and Eldians to put aside their differences?

Like how France and England have a beef that lasted for like 700+ years non stop, only to gradually stop as modern age close by

Marleyans amongst any other countries were the most tolerable for the Eldians since they were the ones directly always in contact with them,

Some Marleyans can be shown to be friends with them actually