Pattern hair loss usually progresses over years, not weeks — but the speed varies enormously between people and even between decades of the same person's life. Some lose visibly within two or three years; others plateau for long stretches.
Transcript
Slowly and in steps rather than a straight line. Pattern hair loss runs over years with quiet stretches and faster ones, and it doesn't announce which you're in. That's the problem with judging it yourself. The change per month is smaller than the difference between two haircuts, two lighting conditions, and two moods. So people conclude nothing is happening right up until something obviously is.
Sudden, heavy shedding over weeks is a different picture and usually points to a trigger — stress, illness, medication, childbirth — rather than pattern loss alone. That distinction matters medically, so bring it to a doctor promptly.
Because the pace is so individual, the honest answer for you comes from measurement: two standardized checks a few months apart establish your actual trajectory, which beats any statistic.