If the 300m people lived in the same area and you got a true random sample.
Sunsets at 9:09 today in Michigan
Sunsets at 8:04 today in California
Sunsets at 8:34 today in North Carolina
Sunsets at 7:57 today in Alabama
Sunsets at 7:38 today in Arizona (They are on standard time)
Sunsets at 7:13 today in Hawaii
Sunsets at 11:36 today in Alaska
Someone in Arizona might want the sun to set at 7:38. It’s blazing hot all day.
Someone in Michigan might be fine with sunsetting at 8:08 with standard time.
Someone in Alabama might not want the sun to set at 6:57.
Someone in Hawaii probably doesn’t want the sun to set at 6:13.
Even if you split up the 1000 people to equally represent all states, that’s only 20 people per state.
One million seconds is 11.6 days
One billion seconds is 31.7 years