I had, had put in several weeks that were between 60 and 90 hours a week.
For several weeks, I worked between 60 and 90 hours a week. 
Я потратил несколько недель, которые составляли от 60 до 90 часов в неделю.
В течение нескольких недель я работал от 60 до 90 часов в неделю. 