From dwell (verb) + time (noun). Dwell derives from Old English dwellan (to lead astray, hinder, delay), later shifting to mean 'to remain, abide, stay' in Middle English — from Proto-Germanic dwaljaną. The noun phrase dwell time as a technical compound is modern, emerging in engineering and manufacturing contexts in the mid-20th century, and adopted into digital and retail analytics by the 2000s.