Ejemplo:
"Hurry! The hour glass is running out - so that means that our 60 seconds are almost up", said Paula to her team members. 
The Noun Project
Autorización de foto:
Licencia CC: Atribución, uso colmercial
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
Scientific Instruments: hour glass
This simple device, normally made from sand and wood, was used to measure time periods before clocks and watches were invented.