This is the 18290th most frequent Russian word.
шестидневнои
"Шестидневной" means "six-day" or "lasting six days."
Used as an adjective describing a workweek that spans six days.
Я изучаю информацию о шестидневной рабочей неделе.
I am studying information about the six-day workweek.
Used as an adjective describing efforts that lasted for six days.
Его шестидневные усилия привели к успеху.
His six-day efforts led to success.
Used as an adjective describing a laboratory operating or defined within a six-day context.