What Unicode character symbol(s) express duration (such as a clock, hourglass, or other timepiece)?
For example "★3⅔" instead of "3 hours and forty minutes", where ★ is a time symbol.
The following code points exist related to clocks, watches, and other devices to indicate time:
⌚ U+0231A WATCH
⌛ U+0231B HOURGLASS
⏰ U+023F0 ALARM CLOCK
⏱ U+023F1 STOPWATCH
⏲ U+023F2 TIMER CLOCK
⏳ U+023F3 HOURGLASS WITH FLOWING SAND
⧖ U+029D6 WHITE HOURGLASS
⧗ U+029D7 BLACK HOURGLASS
📅 U+1F4C5 CALENDAR
📆 U+1F4C6 TEAR-OFF CALENDAR
🕐 U+1F550 CLOCK FACE ONE OCLOCK
🕜 U+1F55C CLOCK FACE ONE-THIRTY
🕑 U+1F551 CLOCK FACE TWO OCLOCK
🕝 U+1F55D CLOCK FACE TWO-THIRTY
🕒 U+1F552 CLOCK FACE THREE OCLOCK
🕞 U+1F55E CLOCK FACE THREE-THIRTY
🕓 U+1F553 CLOCK FACE FOUR OCLOCK
🕟 U+1F55F CLOCK FACE FOUR-THIRTY
🕔 U+1F554 CLOCK FACE FIVE OCLOCK
🕠 U+1F560 CLOCK FACE FIVE-THIRTY
🕕 U+1F555 CLOCK FACE SIX OCLOCK
🕡 U+1F561 CLOCK FACE SIX-THIRTY
🕖 U+1F556 CLOCK FACE SEVEN OCLOCK
🕢 U+1F562 CLOCK FACE SEVEN-THIRTY
🕗 U+1F557 CLOCK FACE EIGHT OCLOCK
🕣 U+1F563 CLOCK FACE EIGHT-THIRTY
🕘 U+1F558 CLOCK FACE NINE OCLOCK
🕤 U+1F564 CLOCK FACE NINE-THIRTY
🕙 U+1F559 CLOCK FACE TEN OCLOCK
🕥 U+1F565 CLOCK FACE TEN-THIRTY
🕚 U+1F55A CLOCK FACE ELEVEN OCLOCK
🕦 U+1F566 CLOCK FACE ELEVEN-THIRTY
🕛 U+1F55B CLOCK FACE TWELVE OCLOCK
🕧 U+1F567 CLOCK FACE TWELVE-THIRTY
🕰 U+1F570 MANTELPIECE CLOCK
🗓 U+1F5D3 SPIRAL CALENDAR PAD
You can copy and paste the characters from this page into most editors.
At unicode-table.com you might find more useful code points.