While there may be exceptions, the measurements noted are generally defined as--Constantly: 5.5+ hours per 8-hour day; Frequently: 2.5 - 5.5 hours per 8-hour day; Occasionally: 0 - 2.5 hours per 8-hour day. Occasionally reach overhead, reach at floor, stoop, squat, crouch, kneel, crawl, climb stairs, climb ladders, pivot, twist, pinch, perform fine motor movements.