Other durations
About a 11 hours 5 minutes alarm
11 hours 5 minutes is about 7.4 sleep cycles of 90 minutes. If you want to wake at the end of a cycle, the alarms below at 10 hours 30 minutes and 12 hours are the closest cycle boundaries.
If you fall asleep in the usual 14 minutes, 11 hours 5 minutes gives about 10 hours 51 minutes of sleep, roughly 7.2 sleep cycles of 90 minutes.
11 hours 5 minutes is 665 minutes, or 39,900 seconds. In hours and minutes that is 11 h 05 min. The alarm time updates live above, so the number you see is the actual clock time it will ring if you press the button now.
The alarm is created as a one-time alarm at the exact clock time, so you can see it in the list above, rename it, or switch the sound. Keep this tab open with the volume up; on desktop it rings from a background tab, on a phone keep the page in the foreground and the screen stays on automatically.
Prefer a countdown?
If you want to watch the time tick down rather than set a clock time, use the timer instead. Both ring with the same sounds.