The story
- Proto-Indo-European*dweh₂-
- Proto-Indo-European*dweh₂rós
- Proto-Italic*dūros
- Latindūrus
- Latindūrō
- Medieval Latindūrātiō
- Old Frenchduracion
- Middle Englishduracioun
- Englishduration
- English todayduretics
From duration + -etic + -s.
Etymology from Wiktionary, CC BY-SA 4.0.