Well for me the first M the spew lasted lets see 9 years after the D was final..then I moved away, changed all my cell /phone numbers..saw her at my son's wedding in July, we spoke. No spew.
since I'm a 2 timer and I'm in the middle of another D and I have a daughter that is 2 and if all goes as the first one went then I expect to receive spew for at least 16 more years. Throw D2's college time in there and that would make it an even 20 years..