timescale

The story

1. Proto-Indo-European*deh₂-
2. Proto-Indo-European*deh₂y-
3. Proto-Indo-European*dih₂-mon-
4. Proto-Germanic*tīmô
5. Proto-West Germanic*tīmō
6. Old Englishtīma
7. Middle Englishtyme
8. Englishtime
9. Proto-Indo-European*skend-
10. Proto-Indo-European*(s)kn̥d-sleh₂
11. Proto-Italic*skand-slā
12. Latinscāla
13. Middle Englishscale
14. Englishscale
15. English todaytimescale

From time + scale.