Modules / Mind
Focus in blocks, with a name on each one so the totals mean something later.
How it works
Fifteen, twenty five, forty five, fifty, ninety. Twenty five is the default, and the other four exist because twenty five is often wrong.
One field above the button. It costs two seconds and it is the difference between forty nine sessions and forty nine sessions you can account for.
Counted all time, with three today and a chart of the last fortnight underneath.