(i) the delay, and (ii) the hit area and (iii) the context of use.
The delay needs to be long enough to distinguish an intentional “hover”
the delay needs to be short enough to happen before the user clicks the link or they move their mouse-away.
With small menus, if the user “wobbles” their mouse and accidentally moves the cursor outside of the hit area, the menu disappears while they are trying to read it,
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