This proof of concept marks a running timer by placing a unix timestamp in a marker file. When a running timer is paused, the difference in seconds between the start time and now is saved to a 'splitx' file. Entries in the splits file are included in the final tally.
Inspired by a question on Reddit: https://www.reddit.com/r/linuxquestions/comments/d7am8l/timer_linked_to_conky_and_keyboard_button_that_is/