How long does it take for someone to leave an abusive relationship? why do they never take your advice when you’re only trying to help?

my sister is in an abusive relationship. she has a child with this person as well and she thinks “well.. he could change”
that’s not the case. everyday it gets worse. what do you do? i hate seeing her getting this type of treatment and it’s not fair.
How long does it take for someone to leave an abusive relationship? why do they never take your advice when you’re only trying to help?
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