Time flies ... Represents elapsing time in a particular matter. Can be used as a reminder of something or a warning: "Your time is running out".
The hourglass not done emoji was introduced in 2010 and released as part of the Unicode 11.0 standard. This emoji can be found under the travel and places
category. Because the hourglass not done emoji has been around for quite some time, it should display correctly in the majority of operating systems.