In your statusline
real outputOne short line, rendered on every turn. It says the binding clock and nothing else, because a statusline that needs reading is a statusline you stop seeing.
40% · 1h43m
Captured from this machine. Forty percent of the five-hour window left, rolling in an hour and forty-three.
Or in a spare pane
The same reading, refreshing, for a second terminal you glance at rather than read.
rr-coach watch --every 20
Costs nothing to leave running: every refresh is a local file read, and the calendar is cached.