 Committing to a 30-year study may seem daunting, but the actual amount of participation is very limited. Over the next 30 years, we will contact participants just twice per year, two 30-minute sessions. And so what I try and remind women is 30 years feels like a long time, but what we're asking is one hour of your time every year for 30 years, which basically equates to essentially 24 hours over the course of 30 years, about a workday.