A colon.
Doc Clock
At 3 hours 45 minutes there is not an acute angle between the hands of the clock (unless you extend the hands backwards).
It is 5 hours and 6 minutes.
A clock indicates time in hours and minutes, and sometimes in seconds.
Turn the knob next to clock right for hours and left for minutes.
Push the buttons on the clock marked hours and minutes.
0 hours, 45 minutes
600 minutes = 10 hours
hold clock+seek for Hours hold clock+discs for minutes
3 hours 30 minutes = 3.5 hours
Seven hours, fifteen minutes.