Early in the game I sometimes run into an issue with research stalling because of shortfalls in base design or whatever. When that happens the "research finished" estimation shows "0:00", presumably because the math winds up calculating zero progress or something.
It would be nice to display the "infinity" symbol (∞) or something similar if research has made no progress across the set of samples, to give a clearer indication of what is what. If it helps, https://unicode-table.com/en/221E/
