The marker menu contains options which pertain to the time axis markers.
More:
Show Left/Right Markers
Place Left Marker at C Marker (F3)
Place Right Marker at C Marker (F4)
Pan to Left Marker (Ctrl-F3)
Pan to Right Marker (Ctrl-F4)
Lock L-R Marker Delta
Place Left Marker at C Marker (F3)Place Left Marker at C Marker (F3)