"I use Matomo for my analytics. I think their little Javascript doodad attempts to report back time information after 15 seconds. Anyone who clicks away before

"I use Matomo for my analytics. I think their little Javascript doodad attempts to report back time information after 15 seconds. Anyone who clicks away before that timer goes off is recorded as a zero." Why in the world do they measure time on page like that? All they need to do is compare timestamps between hits...