Welcome to a very exclusive group — SPG Lifetime™ Gold. Since joining the program, you've stayed with us at least 250 eligible nights and had at least five years of elite status. That's an accomplishment that calls for a serious reward. So from now on, you'll never go below Gold status, even if you have a light travel year.
Actually my status online says "Since 1999, you have a total of 290 stays and 440 nights". I wonder if something happens at 500 nights.
Yes, since 1999, in about 13 years I have spent over a year in Starwood hotels. I've probably spent at list a similar number in Hilton properties but they don't make it easy to figure out.