Augmented Free Time Calculation or end of day horizontal line

See the image above. It says I have 4h 15m of free time. But, for my daily productivity planning, I don’t want to plan anything past 17:30. So basically I have 2 hours left to plot greatness. It would be a better indicator for me if it just says 2 hours, so people should just be able to customise the end of day. Also could add a horizontal line at the end of day, so it’s clear I don’t want any productivity stuff after that. Ideally, before the horizontal line I would like “plot greatness” with 2 hours available and after the horizontal line I plan “for fun” for 2 hours. It can be such a combination.

The easiest implementation seems to be a horizontal line at 17:30 (if that is the end of day time), and calculate the time left for productivity before that line, and after the horizontal line either no free time indication (easiest), although you can still plan..