Is there a hard fast rule for how long to apply Sandi's rules or 180?

Is it until you feel it is enough or when WW says she's ready to piece?

M 53 W 54, M since 98
D15, D19
8/2013 discovered EA, W maintained contact with OM
until 10/14
7/2/17 W said she wanted S, 7/25/17 moved out of MBR
12/17 W says moving out 5/18, W still in home.