6 years. 1994-2000. I was 4 in 1994 when it was a "girls" trip with my mom, sister, grandma, & aunt.
We went again when I was 10 over my sister's 13th birthday & mother's day.
After that, it was 4 years till the next trip. Then 2 years till my brithday trip & less than a year between trips since 2006. (That includes a year as a CP)