Crossword puzzle clue "put in one's eight hours"

Put in one's eight hours

One finishing a marathon in eight hours, say

Only driver to win the Indianapolis 500, the Daytona 500, the 24 Hours of Daytona, and the 24 Hours of Le Mans

Study for eight hours on the night before a test, say

Eight hours, to many workers

It was scaled in just over eight hours in 2004

It's eight hours later than PST

Seven or eight hours, typically