Ten-Thirty

The long hand points at 6, the short hand sits between 10 and 11. That is half past ten on any analog clock: the minute hand has travelled halfway round, so the hour hand has moved halfway from 10 to 11. It is a time of day, not a length of time; nobody uses it for "ten and a half hours".

The clock in the picture has no AM or PM marker, so 🕥 stands equally for 10:30 and 22:30. On a phone screen the face is tiny, and 🕥 is easy to mistake for 🕙 (ten o'clock) or the neighbouring half hours 🕤 and 🕦. When the exact time matters, people usually write the digits as well and let the emoji decorate them.

What does it mean when someone sends 🕥?

Usually: "at half past ten", or "look at the time". "Meet at 🕥?" is a proposal, "🕥 sharp" a warning, and a lone 🕥 in reply to "when?" is the answer. In announcements and event posts a clock emoji simply marks the line that gives the time, the way 📍 marks the place.

The hands are not always meant literally. Many people pick whichever clock face their keyboard offers first to mean "time" in general: a countdown, a reminder, "running late", "still up". If the hands disagree with the time written next to them, trust the digits. If there is no time at all, the emoji is probably about time passing rather than 10:30.