For me, it was something I held close to my chest for some time. I don't even know if I had the right time.
In my instance.... I practiced the speech for at least 2 weeks, until I could cite it word for word...
I stopped myself from doing it for another 3 weeks, because she missed one of the weeks, and seemed rather flustered/not happy the other 2 weeks (one of which she complained how bad/crappy of a day she had at work).
I delayed another week because her parents there with us.
I finally had a day where she was pleasant, talkative, asking if I had plans for the weekend, etc.
I asked her if I could talk to her in private for a few moments (that did put her on guard). But I said "don't worry, I'll be brief, and there is just something I feel the need to ler you know".
Me: 43 M: 10y S:15 ILYBINILWY 2/18/13 W moved out 2/18/13 Filed for D: 2/17/13 Got DB: 2/20/13 Got DR: 2/23/13 180 & LRT Began: 2/25/13 D Final Dec '13