I was at 850+ nights, 1.96 million points (all Marriott), and I merged my accounts. I'm beginning to think that was a mistake as I can't find my lifetime points anymore... I should have waited until I was confirmed over 2 million points, if only to save me some worrying.
The website shows I'm lifetime platinum now with 9 years of platinum (which doesn't seem like the right amount of years.. should be more like 6).