Stop guessing the clock
Set a visible timer
Rest is only useful when it is on purpose. Counting in your head turns into ninety seconds one set and four minutes the next. A timer makes rest a decision instead of a vibe.
Most coaches run 2 to 5 minutes for heavy strength work and roughly 60 to 90 seconds for hypertrophy work. Pick the range, start the clock, train the next set when it says so.